Khan Academy: Triangle Inequality Theorem: Triangle Inqequality Theorem

In this triangles learning exercise, 10th graders solve and complete 10 different problems that include applying the Triangle Inequality Theorem. First, they use the illustrated triangles and the data table to test the theorem. Then,...

Learners estimate and measure triangles. In this geometry lesson, students identify the relationship between three sides and a triangle. They use the inequality theorem to decide if a triangle will be formed or not.

Can any three lengths make a triangle? One of the videos in a playlist on basic geometry introduces the Triangle Inequality Theorem. Using three given lengths, the presentation illustrates the restrictions on lengths of any side of a...

This video shows a proof for the Pythagorean Theorem by breaking a right triangle into two similar triangles and setting up ratios of corresponding sides.

More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.

This video demonstrates how to solve the width of a rectangular carpet given the length and the diagonal of the rectangle by using the Pythagorean theorem.

This video tutorial [13:03] explains that the Pythagorean theorem can only be used on right triangles and explains how it is used. Gives several examples using the Pythagorean theorem to find the unknown side of a right triangle....

This video tutorial lesson [4:17] involves solving for the length of one of the legs of a right triangle using the Pythagorean theorem.

This video tutorial lesson [4:32] uses the Pythagorean theorem to find the hypotenuse of a right triangle in an application problem.

The video tutorial lesson [3:00] demonstrates the solving the width of a rectangular carpet by using the Pythagorean theorem, given the length and the diagonal of the rectangle.