This math skill teaches how to find the missing angle in a triangle by using the principle that the sum of the angles in a triangle always equals 180 degrees. Subtract the sum of the known angles from 180 to find the missing angle.
Find the missing angle on a triangle
Test your understanding of find the missing angle on a triangle by practicing it! Work through the below exercises to use it in practice.
🎙️
Find the missing angle on this triangle
🎙️
The inside angles of a triangle always add up to 180. So 60 plus 70, plus our mystery angle, equals 180
🎙️
60 plus 70 is 130, so our mystery angle is 180 minus 130, or 50 degrees