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Updated Mar 22, 2026
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Comprendre le Calcul de l'Aire d'un Parallélogramme et le Volume d'un Prisme en Géométrie
Solides en géométrie
Cette page se concentre sur les formules pour calculer le volume et l'aire des solides géométriques, incluant le cube, le pavé droit, le prisme, la pyramide, le cône, le cylindre et la sphère.
Definition: Un solide est un objet géométrique en trois dimensions ayant une longueur, une largeur et une hauteur.
La formule pour le volume d'un prisme en géométrie est particulièrement importante et s'applique à plusieurs formes. Elle consiste à multiplier l'aire de la base par la hauteur du prisme.
Highlight: Le volume d'un cube est calculé en élevant la longueur de son côté au cube (c³), tandis que son aire totale est 6 fois l'aire d'une face (6 x c²).
Pour le pavé droit, le volume est le produit de la longueur, la largeur et la hauteur. Le prisme utilise l'aire de sa base multipliée par sa hauteur pour le volume, et le périmètre de sa base multiplié par sa hauteur pour l'aire latérale.
Example: Un prisme triangulaire avec une base d'aire 10 cm² et une hauteur de 5 cm aurait un volume de 10 x 5 = 50 cm³.
La pyramide et le cône ont des formules de volume similaires, impliquant l'aire de la base multipliée par la hauteur, divisée par 3. Le cylindre utilise l'aire de sa base circulaire multipliée par sa hauteur pour le volume, et 2π x rayon x hauteur pour l'aire latérale.
Enfin, la sphère a des formules uniques pour son volume et son aire (4 x π x r²), où r représente le rayon.
Quote: "La géométrie est l'art de bien raisonner sur des figures mal faites." - Henri Poincaré
Ces formules sont essentielles pour comprendre et calculer les propriétés des solides en géométrie tridimensionnelle.
Figures planes en mathématiques
Cette page présente les formules essentielles pour calculer le périmètre et l'aire des figures planes courantes en mathématiques. Les figures abordées comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et le cercle.
Highlight: Le calcul de l'aire d'un parallélogramme en mathématiques est une application importante de ces formules.
Pour le carré, le périmètre est calculé en multipliant le côté par 4, tandis que l'aire est obtenue en élevant le côté au carré. Le rectangle utilise la somme des longueurs et largeurs multipliée par 2 pour le périmètre, et le produit de la longueur par la largeur pour l'aire.
Example: Pour un carré de côté 5 cm, le périmètre serait 5 x 4 = 20 cm, et l'aire 5² = 25 cm².
Le triangle a un périmètre égal à la somme de ses trois côtés, et son aire est calculée en multipliant la base par la hauteur, divisé par 2. Le trapèze et le parallélogramme ont des formules spécifiques pour leur périmètre et leur aire, impliquant leurs différents côtés et leur hauteur.
Vocabulary: Le périmètre est la longueur du contour d'une figure plane, tandis que l'aire représente sa surface.
Enfin, pour le cercle, la longueur (circonférence) est calculée avec la formule π x diamètre, et l'aire avec π x rayon².
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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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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
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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
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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
Comprendre le Calcul de l'Aire d'un Parallélogramme et le Volume d'un Prisme en Géométrie
Voici un résumé détaillé des figures planes et des solides en mathématiques, mettant l'accent sur les formules de calcul des périmètres, aires et volumes.
• Les figures planes comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et... Show more
Solides en géométrie
Cette page se concentre sur les formules pour calculer le volume et l'aire des solides géométriques, incluant le cube, le pavé droit, le prisme, la pyramide, le cône, le cylindre et la sphère.
Definition: Un solide est un objet géométrique en trois dimensions ayant une longueur, une largeur et une hauteur.
La formule pour le volume d'un prisme en géométrie est particulièrement importante et s'applique à plusieurs formes. Elle consiste à multiplier l'aire de la base par la hauteur du prisme.
Highlight: Le volume d'un cube est calculé en élevant la longueur de son côté au cube (c³), tandis que son aire totale est 6 fois l'aire d'une face (6 x c²).
Pour le pavé droit, le volume est le produit de la longueur, la largeur et la hauteur. Le prisme utilise l'aire de sa base multipliée par sa hauteur pour le volume, et le périmètre de sa base multiplié par sa hauteur pour l'aire latérale.
Example: Un prisme triangulaire avec une base d'aire 10 cm² et une hauteur de 5 cm aurait un volume de 10 x 5 = 50 cm³.
La pyramide et le cône ont des formules de volume similaires, impliquant l'aire de la base multipliée par la hauteur, divisée par 3. Le cylindre utilise l'aire de sa base circulaire multipliée par sa hauteur pour le volume, et 2π x rayon x hauteur pour l'aire latérale.
Enfin, la sphère a des formules uniques pour son volume et son aire (4 x π x r²), où r représente le rayon.
Quote: "La géométrie est l'art de bien raisonner sur des figures mal faites." - Henri Poincaré
Ces formules sont essentielles pour comprendre et calculer les propriétés des solides en géométrie tridimensionnelle.
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Improve your grades
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Figures planes en mathématiques
Cette page présente les formules essentielles pour calculer le périmètre et l'aire des figures planes courantes en mathématiques. Les figures abordées comprennent le carré, le rectangle, le triangle, le trapèze, le parallélogramme et le cercle.
Highlight: Le calcul de l'aire d'un parallélogramme en mathématiques est une application importante de ces formules.
Pour le carré, le périmètre est calculé en multipliant le côté par 4, tandis que l'aire est obtenue en élevant le côté au carré. Le rectangle utilise la somme des longueurs et largeurs multipliée par 2 pour le périmètre, et le produit de la longueur par la largeur pour l'aire.
Example: Pour un carré de côté 5 cm, le périmètre serait 5 x 4 = 20 cm, et l'aire 5² = 25 cm².
Le triangle a un périmètre égal à la somme de ses trois côtés, et son aire est calculée en multipliant la base par la hauteur, divisé par 2. Le trapèze et le parallélogramme ont des formules spécifiques pour leur périmètre et leur aire, impliquant leurs différents côtés et leur hauteur.
Vocabulary: Le périmètre est la longueur du contour d'une figure plane, tandis que l'aire représente sa surface.
Enfin, pour le cercle, la longueur (circonférence) est calculée avec la formule π x diamètre, et l'aire avec π x rayon².
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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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