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Angle Sum of a Triangle

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More Lessons for Grade 9

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Videos, worksheets, games and activities to help Geometry students learn about the angle sum of a triangle.

What is the Triangle Sum Theorem?
The Triangle Sum Theorem states that the sum of the interior angles of a triangle equal 180°.

Triangle Angle Sum
The sum of the three angles in any triangle sum to 180 degrees. The importance of this fact in Geometry cannot be emphasized enough. The triangle angle sum theorem is used in almost every missing angle problem, in the exterior angle theorem, and in the polygon angle sum formula.
This video, discusses the sum of the interior angles of a triangle always equals 180 degrees. There are 4 example problems from easy, medium, medium-hard, and hard.
Angle Sum of a Triangle

Angles of a Triangle - Triangle Sum Theorem
Students learn the triangle sum theorem, which states that the sum of the measures of the angles of a triangle is 180 degrees. Students are then asked to solve problems related to the triangle sum theorem using Algebra.
Geometry Word Problems - Angles of a Triangle


You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.

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