Quadrilateral overview | Perimeter, area, and volume | Geometry | Khan Academy

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"Quad" means "four" and "lateral" means "line." A quadrilateral is literally a shape with four sides (lines) and four angles. Let's learn the difference between concave and convex quadrilaterals as well as trapezoids, parallelograms, and rhombi.
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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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[@Kingschess498]

When you misspell parallelogram da da da da da parallelolgram, with a lol.

[@chriswalbridge427]

Whaddup with the CONCAVE BOOMERANG???🤔

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Ohh, it's autumn and you didn't mention the deltoid! ;)

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4 dislikes? why would anyone dislike any khan video?

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Really helpful 😊. Am feeling really thankful to u 😍😍😍😍

[@mmmadelinem378]

what is that website or app you used for the explanation?

[@xtramaze-musicmaster9165]

was anyone laughing when sal was pronouncing parallelogram?

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The ignorance is strong with this one. People hate to see someone smarter than them.

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Thank goodness KZbin didn’t take down this comment section 😄

[@mimiklimberg1257]

These are awesome. Clarifies all of those fuzzy details.

[@tequiliaboone7021]

Thank you for the help

[@IsItTobz]

Thanks Khan for this explanation.

[@mclovin-qg7rn]

a rhombus is just a square italicized

[@elizabethcabbage9817]

he made the one look like a boomerang Haha!