These lessons help Grade 8 students to learn about the 45-45-90 special right triangle.

**Related Pages**

30-60-90 Right Triangle

Other Special Right Triangles

More lessons for Grade 7 and Grade 8

Math Worksheets

**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:√2.

**Introduction to 45-45-90 Triangles**

**Special Right Triangles (45-45-90)**

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.

**Solve a 45-45 Right Triangle**

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

Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.