Equations and geometry

This course is a part of Algebra basics, a 8-course Topic series from Khan Academy.

See how algebra can be useful when solving geometrical problems.

This course contains 5 segments:

Equations & geometry

Solve problems in geometry by creating and solving appropriate linear equations.

Triangle angles

Do the angles in a triangle always add up to the same thing? Would I ask it if they didn't? What do we know about the angles of a triangle if two of the sides are congruent (an isosceles triangle) or all three are congruent (an equilateral)? This tutorial is the place to find out.

Pythagorean theorem

Named after the Greek philosopher who lived nearly 2600 years ago, the Pythagorean theorem is as good as math theorems get (Pythagoras also started a religious movement). It's simple. It's beautiful. It's powerful.

Triangle similarity intro

In this tutorial, we will use what we learned about similarity of polygons in the specific case of triangles. We will come up with specific conditions for triangles to be similar, and use them to determine whether two triangles are similar.

Solving similar triangles

Learn how to find missing measures of triangles using the fact that they are similar to other triangles.