Exterior Angle Theorem Worksheet
Grade 9 Math worksheet focusing on the Exterior Angle Theorem with various question types.
Includes
Standards
Topics
Exterior Angle Theorem
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Read each question carefully and answer to the best of your ability. Show all your work for full credit.
1. In your own words, state the Exterior Angle Theorem.
2. The measure of an exterior angle of a triangle is equal to the sum of the measures of which two angles?
The two adjacent interior angles
The two non-adjacent interior angles
The sum of all three interior angles
None of the above
3. If an exterior angle of a triangle measures 110 degrees, and one of the remote interior angles measures 50 degrees, the other remote interior angle must measure degrees.
4. Consider the triangle ABC. If the exterior angle at vertex C is 125 degrees, and angle A is 60 degrees, what is the measure of angle B?
5. An exterior angle of a triangle can be acute.
True
False
6. In triangle PQR, the exterior angle at Q is (3x + 10) degrees. Angle P is (x + 20) degrees and angle R is (x + 30) degrees. Find the value of x and the measure of the exterior angle at Q.
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