What is a 30-60-90 Degree Triangle?

Note:

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!

Keywords:

definition
triangle
special triangle
30-60-90
derivation

Background Tutorials

Points and Lines
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  A math term can really tell you a lot about the thing it's describing. Take the term line segment. A line segment is just part of a line! In this tutorial, learn about line segments, how to name them, and what the midpoint of a line segment is!
Planes and Angles
- What is an Angle?
  
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  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!
Triangle Definitions
- What are Acute, Obtuse, and Right Triangles?
  
  Did you know that there are different kinds of triangles? Knowing how to identify these triangles is an important part of solving many problems involving these triangles. Check out this tutorial and learn about some of the different kinds of triangles!
Right Triangles and the Pythagorean Theorem
- What are the Legs and Hypotenuse of a Right Triangle?
  
  Looking for some terminology used with right triangles? Then this tutorial was made for you! In this tutorial, you'll be introduced to the names for the different parts of a right triangle. Check it out!
- What is the Pythagorean Theorem?
  
  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!
Powers and Exponents
- How Do You Square a Number?
  
  Want to square a number? Just take the number and multiply it by itself! If you square an integer, you get a perfect square! Check out squaring in this tutorial!
Simplifying Expressions
- What are Like Terms?
  
  Combining like terms together is a key part of simplifying mathematical expressions, so check out this tutorial to see how you can easily pick out like terms from an expression
Solving for a Variable
- How Do You Solve for a Variable in Terms of Another Variable?
  
  Got an equation with two variables? Want to solve for one variable in terms of the other? Want to go the other way around? See how in this tutorial!