The sum of the three interior angles in a triangle is always 180°.
The Triangle Sum Theorem is also called the Triangle Angle Sum Theorem or Angle Sum Theorem.
Find the value of x in the following triangle.
x + 24° + 32° = 180° (sum of angles is 180°)
x + 56° = 180°
x = 180° – 56° = 124°
The follwing videos show how to prove that the sum of the angles of a triangle is 180 degrees. (Triangle Sum Theorem)
The following videos show more examples of how to solve problems related to the triangle sum theorem using Algebra.How to Find the Missing Angle in a Triangle Using the Triangle Sum Theorem
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.