What is a 45°-45°-90° Triangle?

What is a 45°-45°-90° Triangle?

Note:

A 45-45-90 triangle is a special right triangle with some very special characteristics. If you have a 45-45-90 triangle, you can find a missing side length without using the Pythagorean theorem! Check out this tutorial to learn about 45-45-90 triangles!

Keywords:

  • definition
  • 45 45 90
  • 45-45-90
  • special triangle
  • right triangle
  • pythagorean theorem

Background Tutorials

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      You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!

  • Relating Side Lengths and Angle Measures

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  • Measuring Angles

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      What are Acute, Obtuse, Right, and Straight Angles?

      Did you know that there are different kinds of angles? Knowing how to identify these angles is an important part of solving many problems involving angles. Check out this tutorial and learn about the different kinds of angles!

  • The Pythagorean Theorem

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      The Pythagorean theorem is a very popular theorem that shows a special relationship between the sides of a right triangle. In this tutorial, you'll get introduced to the Pythagorean theorem and see how it's used to solve for a missing length on a right triangle!

  • Congruence in Right Triangles

  • Trapezoids and Kites

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      A trapezoid is a special type of quadrilateral with some special properties. This tutorial introduces you to trapezoids and gives you a look at the special properties needed for a quadrilateral to be called a trapezoid. Check it out!

Further Exploration

  • Special Right Triangles

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      What is a 30-60-90 Degree Triangle?

      A 30-60-90 triangle is a special right triangle with some very special characteristics. If you have a 30-60-90 degree triangle, you can find a missing side length without using the Pythagorean theorem! Check out this tutorial to learn about 30-60-90 triangles!