Exterior Angle Theorem

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High School Math based on the topics required for the Regents Exam conducted by NYSED.
Learn the exterior angle theorem and to find unknown angles.

The following diagram shows the exterior angle theorem formula. Scroll down the page for more examples and solutions using the exterior angle theorem formula to solve problems.
Exterior Angle Theorem Formula

Exterior Angles Triangle
Finding the Unknown Angle

Triangle Exterior Angle Theorem
This video discusses the exterior angle theorem. It also define what exterior and remote interior angles are. Two example problems are solved in detail. The first example problem is pretty basic. The second example problem is much harder.

Exterior Angle Theorem
This video explains the exterior angle theorem of geometry. The theorem is used to work out some applications in finding angles of a triangle.

Exterior Angle Theorem
Students learn the exterior angle theorem, which states that the exterior angle of a triangle is equal to the sum of the measures of the remote interior angles.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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