Triangle-Angle-Sum

How Do You Find a Missing Angle in a Triangle?

Trying to find a missing interior angle measurement in a triangle? Already know the other two interior angle measurements? Then you're set! Just remember that the interior angles of a triangle ALWAYS add up to 180 degrees. This tutorial shows you how to put this knowledge into an equation and solve to find that missing measurement!
What is the Triangle Sum Theorem?

When you're dealing with triangles, the Triangle Sum theorem can be very useful in finding interior angle measurements. In this tutorial, learn how to find this helpful theorem!