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 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
Toggle Auto Play (On)
Audio Voice (Mobius Voice)
Toggle Teaching (Video)
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.