Videos, worksheets, stories and songs to help Grade 8 students learn about the 45-45-90 special right triangle.

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45-45-90 Triangles

A 45-45-90 triangle is a special type of isosceles right triangle where the two legs are congruent to one another and the non-right angles are both equal to 45 degrees. Many times, we can use the Pythagorean theorem to find the missing legs or hypotenuse of 45-45-90 triangles. The ratio of the sides to the hypotenuse is always 1:1:square root of two.

This video explains in more detail about the 45-45-90 special right triangle. It also solves 3 different 45-45-90 right triangle problems that you will come across in your geometry class.

This video provides examples of how to solve a 45-45-90 triangle given the length of one side.

You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.