# Perimeter And Area: The Basics | Perimeter, Area, And Volume | Geometry | Khan Academy

Great geometry primer on perimeter and area. Listen carefully. Sal explains the concepts so you’ll understand them.

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Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large–from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine (“It’s good for you!”), it’s at the core of everything that exists–including you. Having said all that, some of the specific topics we’ll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That’s a lot. To summarize: it’s difficult to imagine any area of math that is more widely used than geometry.

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## 37 thoughts

1. Warsaw911 says:

You guys saved my grade’s ass multiple times. Thanks.

2. Nicholas Teichgraeber says:

didn’t help

3. Fantastic Sammi says:

i get it!!! yay! i was having trouble understanding perimeter and area in class so i thought maybe i can find a video to help me understand it more. And i found this video! it helped me so much! Thank you so much Khan academy!

4. Fantastic Sammi says:

I todally appreciate your help and your channel!! Good job!! SQEAL!!!

5. Fantastic Sammi says:

i meant SQUEAL!

6. Holli CowMC says:

for me you are the best teacher for science and math xD Lewl

7. Doge WoW says:

Anyone in twenty 16

8. Doge WoW says:

Lol

9. Doge WoW says:

Watching this

10. Mian TV says:

Dude thank you know I und Rostand area you are going to make me bomb my test yo bro I love watching your videos

11. SpaceAcrux says:

let’s hope he saves my ass when I tak the accuplacer a second time and hope I pass

12. Starlynn mylastnamehehe says:

YOU SAVED MY LIFE I LOVE YOU

13. Atulya Kumar says:

WELL THEN, he forgot to add the squared symbol at the end of the actual answer for area….you supposed to do that right?

14. Charles Juris says:

any one go to glaicercreek middle school

15. PT_YOUNG YT says:

thanks for the  help guys

16. Katelynn phan says:

I am in 4th grade and is way ahead of level in school!!! THANKS

17. azzriva aliya yulizar says:

ILYSM TOMORROW IS MY QUIZ IN THIS AND I WAS ABSENT FOR THE LAST 2 WEEKS BUT THIS HELPED ME ALOTTTTTTTTTT

18. duhitzloretta says:

Kind of help me but not really it’s kind of confusing

19. Christopher Romero says:

Doesn’t help

20. Christopher Romero says:

21. HYPEOneMC says:

Thank you

so….. basically it’s length times width

23. Samriddhi Thapa says:

It’s very use full

24. Suresh Waykule says:

very good to understand the basic of Perimeter and area

25. Natalie tran says:

Hey that is

26. Warlord Alan says:

In a nutshell Perimeter=Add up all the sides Area=Length x Width

ur confusing everyone khan academy. You said perimeter of abcd is 7 plus 5 plus 7 plus 5. Thats equivelent to l plus w x2

28. Natalie Shrestha says:

This video is 6 years old and it’s still helpful

29. Dalan 20 says:

What app are you using

30. TheWigglyTuber - Agario says:

How do you draw so straight in pc your epic! 👍🏻❤️

31. udara pillawa says:

whats the app

32. Cinnamon Sean Kelly says:

33. Rafael Benedic says:

Im watching for exam

34. Sudaiskhan Sudaiskhan says:

are u Pakistani

35. Jesus Rodelas says:

sorry

36. Jesus Rodelas says:

thank you for teaching me

37. Ian Radcliff says:

I have a test on geometry tomorrow. Hope this saves me.