05:24
Triangles: Pythagorean Theorem, The
This clip introduces the Pythagorean Theorem, named for the Greek mathematician Pythagoras. In addition to explaining the theorem itself, the clip explains how it is commonly used, including as a way to determine if a triangle is a right triangle, a...
01:18
Introduction to Right Triangles
A right triangle is a triangle that has one right, or 90 degree, angle in it. A right triangle has two perpendicular sides called legs, and a side opposite the right angle called the hypotenuse.
01:31
Verifying Right Triangles with the Pythagorean Theorem Practice Problem
The Pythagorean Theorem is used to verify that a triangle is a right triangle, which is important because it is not always possible to determine visually.
01:08
Verifying Right Triangles with the Pythagorean Theorem
The Pythagorean Theorem can be used to determine whether a triangle is a right triangle, given the length of its sides.