Trojuholníky sú úžasné geometrické tvary, ktoré nájdeš všade okolo seba... Show more
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Updated Mar 17, 2026
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Trojuholníky: Typy a vlastnosti
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Základy trojuholníkov a ich označovanie
Trojuholník je rovinný útvar, ktorý má presne tri strany, tri vrcholy a tri vnútorné uhly - vždy! Je to jeden zo základných tvarov v geometrii.
Aby si sa v trojuholníkoch vyznal, musíš poznať základné označenia. Strany označujeme malými písmenami a, b, c. Vrcholy označujeme veľkými písmenami A, B, C. Uhly označujeme gréckymi písmenami α (alfa), β (beta), γ (gama).
Tu je dôležitý trik na zapamätanie: strana a je vždy oproti vrcholu A, strana b oproti vrcholu B a strana c oproti vrcholu C. Rovnako aj s uhlami!
Tip na zapamätanie: Predstav si trojuholník ako malý dom s troma rohmi - každý roh je vrchol a každá stena medzi rohmi je strana.
Triedenie trojuholníkov podle strán
Trojuholníky môžeme rozdeliť podľa toho, aké dlhé majú strany. Toto rozdelenie je veľmi jednoduché - stačí sa pozrieť na dĺžky!
Rôznostranný trojuholník má všetky tri strany rôzne dlhé. Vtedy sú aj všetky uhly rôzne veľké. Rovnoramenný trojuholník má dve strany rovnako dlhé (voláme ich ramená) a tretiu stranu nazývame základňa. Uhly pri základni sú vždy rovnaké!
Rovnostranný trojuholník je najšpeciálnejší - všetky tri strany sú rovnako dlhé a všetky tri uhly majú presne 60°. Je to akási "dokonalá" verzia trojuholníka.
Zaujímavosť: Rovnostranný trojuholník je vlastne aj rovnoramenný, pretože má aspoň dve strany rovnaké!
Triedenie trojuholníkov podľa uhlov
Teraz sa pozrieme na trojuholníky z pohľadu ich uhlov. Toto rozdelenie je super dôležité pre riešenie úloh!
Ostrouhlý trojuholník má všetky tri uhly ostré (menšie ako 90°). Pravouhlý trojuholník má jeden uhol presne 90° - strany pri tomto uhle nazývame odvesny a najdlhšiu stranu oproti pravému uhlu nazývame prepona.
Tupouhlý trojuholník má jeden uhol tupý (väčší ako 90°). Pamätaj si dôležité pravidlo: trojuholník nemôže mať dva pravé alebo dva tupé uhly - vždy len jeden!
Praktický tip: Pravé uhly nájdeš všade okolo seba - rohy stola, rohý knihy alebo rohý telefónu majú všetky 90°.
Súčet uhlov v trojuholníku - najdôležitejšie pravidlo
Tu prichádza na rad najdôležitejšie pravidlo o trojuholníkoch, ktoré si musíš zapamätať na celý život!
Súčet všetkých vnútorných uhlov v každom trojuholníku je vždy 180°. To znamená α + β + γ = 180°. Toto pravidlo platí úplně pre každý trojuholník - či už je malý alebo veľký, rovnostranný alebo rôznostranný.
Toto pravidlo ti pomôže vypočítať chýbajúci uhol, ak poznáš dva ostatné. Jednoducho odčítaš známe uhly od 180° a máš výsledok! Skvelý trik na kontrolu: vždy si spočítaj všetky tri uhly - ak ti nevyjde 180°, niekde je chyba.
Predstav si to takto: Keby si vystrihol trojuholník a odtrhol jeho rohy, potom ich priložil k sebe, vytvorili by rovnú čiaru - a to je presne 180°!
Príklady a riešenie úloh
Teraz si ukážeme, ako používať to, čo sme sa naučili, na konkrétnych príkladoch. Takto to bude na testoch!
Príklad s triedením podľa strán: Trojuholník so stranami 6 cm, 6 cm, 8 cm je rovnoramenný, pretože dve strany (6 cm) sú rovnaké. Príklad s triedením podľa uhlov: Trojuholník s uhlami 45°, 45°, 90° je pravouhlý, pretože má jeden uhol presne 90°.
Výpočet chýbajúceho uhla: Ak máš uhly α = 65° a β = 40°, chýbajúci uhol γ vypočítaš takto: γ = 180° - 65° - 40° = 75°. Vždy si skontroluj: 65° + 40° + 75° = 180° ✓
Skúšobný tip: Na testoch vždy kontroluj súčet uhlov - je to najrýchlejší způsob, ako zistiť, či máš správny výsledok!
Dôležité tipy a triky na zapamätanie
Jeden trojuholník môže patriť do viacerých skupín súčasne. Napríklad rovnostranný trojuholník je zároveň aj rovnoramenný a ostrouhlý!
Pri riešení úloh vždy používaj správne jednotky - uhly v stupňoch (°), strany v centimetroch (cm). Pomôcky ako pravítko a uhlomer ti pomôžu lepšie si predstaviť, o aký trojuholník ide.
Pamätaj si označenia: malé písmená pre strany, veľké písmená pre vrcholy, grécke písmená pre uhly. Toto ti ušetrí veľa času pri riešení úloh!
Záverečná rada: Cvič na rôznych príkladoch - čím viac úloh vyriešiš, tým istejší budeš v rozoznávaní a počítaní s trojuholníkmi!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Matematika
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Trojuholníky: Typy a vlastnosti
Trojuholníky sú úžasné geometrické tvary, ktoré nájdeš všade okolo seba - v domoch, mostoch, dokonca aj v tvojich obľúbených hračkách! Naučíš sa ich rozoznať a pochopiť ich vlastnosti, čo ti bude super užitočné nielen teraz, ale aj v ďalších ročníkoch.
Základy trojuholníkov a ich označovanie
Trojuholník je rovinný útvar, ktorý má presne tri strany, tri vrcholy a tri vnútorné uhly - vždy! Je to jeden zo základných tvarov v geometrii.
Aby si sa v trojuholníkoch vyznal, musíš poznať základné označenia. Strany označujeme malými písmenami a, b, c. Vrcholy označujeme veľkými písmenami A, B, C. Uhly označujeme gréckymi písmenami α (alfa), β (beta), γ (gama).
Tu je dôležitý trik na zapamätanie: strana a je vždy oproti vrcholu A, strana b oproti vrcholu B a strana c oproti vrcholu C. Rovnako aj s uhlami!
Tip na zapamätanie: Predstav si trojuholník ako malý dom s troma rohmi - každý roh je vrchol a každá stena medzi rohmi je strana.
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Triedenie trojuholníkov podle strán
Trojuholníky môžeme rozdeliť podľa toho, aké dlhé majú strany. Toto rozdelenie je veľmi jednoduché - stačí sa pozrieť na dĺžky!
Rôznostranný trojuholník má všetky tri strany rôzne dlhé. Vtedy sú aj všetky uhly rôzne veľké. Rovnoramenný trojuholník má dve strany rovnako dlhé (voláme ich ramená) a tretiu stranu nazývame základňa. Uhly pri základni sú vždy rovnaké!
Rovnostranný trojuholník je najšpeciálnejší - všetky tri strany sú rovnako dlhé a všetky tri uhly majú presne 60°. Je to akási "dokonalá" verzia trojuholníka.
Zaujímavosť: Rovnostranný trojuholník je vlastne aj rovnoramenný, pretože má aspoň dve strany rovnaké!
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Triedenie trojuholníkov podľa uhlov
Teraz sa pozrieme na trojuholníky z pohľadu ich uhlov. Toto rozdelenie je super dôležité pre riešenie úloh!
Ostrouhlý trojuholník má všetky tri uhly ostré (menšie ako 90°). Pravouhlý trojuholník má jeden uhol presne 90° - strany pri tomto uhle nazývame odvesny a najdlhšiu stranu oproti pravému uhlu nazývame prepona.
Tupouhlý trojuholník má jeden uhol tupý (väčší ako 90°). Pamätaj si dôležité pravidlo: trojuholník nemôže mať dva pravé alebo dva tupé uhly - vždy len jeden!
Praktický tip: Pravé uhly nájdeš všade okolo seba - rohy stola, rohý knihy alebo rohý telefónu majú všetky 90°.
Sign up to see the contentIt's free!
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Súčet uhlov v trojuholníku - najdôležitejšie pravidlo
Tu prichádza na rad najdôležitejšie pravidlo o trojuholníkoch, ktoré si musíš zapamätať na celý život!
Súčet všetkých vnútorných uhlov v každom trojuholníku je vždy 180°. To znamená α + β + γ = 180°. Toto pravidlo platí úplně pre každý trojuholník - či už je malý alebo veľký, rovnostranný alebo rôznostranný.
Toto pravidlo ti pomôže vypočítať chýbajúci uhol, ak poznáš dva ostatné. Jednoducho odčítaš známe uhly od 180° a máš výsledok! Skvelý trik na kontrolu: vždy si spočítaj všetky tri uhly - ak ti nevyjde 180°, niekde je chyba.
Predstav si to takto: Keby si vystrihol trojuholník a odtrhol jeho rohy, potom ich priložil k sebe, vytvorili by rovnú čiaru - a to je presne 180°!
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Príklady a riešenie úloh
Teraz si ukážeme, ako používať to, čo sme sa naučili, na konkrétnych príkladoch. Takto to bude na testoch!
Príklad s triedením podľa strán: Trojuholník so stranami 6 cm, 6 cm, 8 cm je rovnoramenný, pretože dve strany (6 cm) sú rovnaké. Príklad s triedením podľa uhlov: Trojuholník s uhlami 45°, 45°, 90° je pravouhlý, pretože má jeden uhol presne 90°.
Výpočet chýbajúceho uhla: Ak máš uhly α = 65° a β = 40°, chýbajúci uhol γ vypočítaš takto: γ = 180° - 65° - 40° = 75°. Vždy si skontroluj: 65° + 40° + 75° = 180° ✓
Skúšobný tip: Na testoch vždy kontroluj súčet uhlov - je to najrýchlejší způsob, ako zistiť, či máš správny výsledok!
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Dôležité tipy a triky na zapamätanie
Jeden trojuholník môže patriť do viacerých skupín súčasne. Napríklad rovnostranný trojuholník je zároveň aj rovnoramenný a ostrouhlý!
Pri riešení úloh vždy používaj správne jednotky - uhly v stupňoch (°), strany v centimetroch (cm). Pomôcky ako pravítko a uhlomer ti pomôžu lepšie si predstaviť, o aký trojuholník ide.
Pamätaj si označenia: malé písmená pre strany, veľké písmená pre vrcholy, grécke písmená pre uhly. Toto ti ušetrí veľa času pri riešení úloh!
Záverečná rada: Cvič na rôznych príkladoch - čím viac úloh vyriešiš, tým istejší budeš v rozoznávaní a počítaní s trojuholníkmi!
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user