Complementary And Supplementary Angles | Angles And Intersecting Lines | Geometry | Khan Academy


Let’s add some tools to our geometry tool belt. Here’s a thorough explanation of complementary and supplementary angles, as well as definitions of adjacent and straight angles.

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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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39 thoughts

  1. Lol angle DAB, I’m surprised he didn’t realize what his angles make up in literacy.

  2. This guy is so good at Articulating, it’s pretty cool to have skills like that.

  3. I love how you make things seem over complicated and do unnecessary steps while trying to explain that the angle equaled “90 degrees”.

  4. this didn’t help with any of my homework (using the complimentary angle theorem) wish you would of showed some actual examples of problems we might see, what you explained / showed was extremely dumbed down and irrelevant to problems we face in the classroom

  5. this is so hard to understand should have gome slower and explained proprely so hard to inderstand god!!!!

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