Test your understanding of the Exterior Angle Theorem.

Try to answer the questions before checking the answers at the bottom of the page.

Question 1

Remote interior angles are 50° and 40°.

Find the exterior angle.

A) 80°
B) 90°
C) 100°

Question 2

Exterior angle = 70°
One interior angle = 30°

Find the other interior angle.

A) 30°
B) 40°
C) 50°

Question 3

Exterior angle = 100°
Remote interior angles are x and x

Find x.

A) 40°
B) 50°
C) 60°

Question 4

Exterior angle = 120°
Remote interior angles are 2x and x

Find x.

A) 30°
B) 40°
C) 60°

Question 5

Exterior angle = 90°
One remote interior angle = 20°

Find the other angle.

A) 50°
B) 60°
C) 70°

Answers

1️⃣ B – 90°

2️⃣ B – 40°

3️⃣ B – 50°

4️⃣ B – 40°

5️⃣ C – 70°

Practice

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Continue Learning

1. Types of Triangles
2. Triangles (Basics)
3. Sum of Angles of a Triangle is 180° (Proof)
4. Find the Missing Angle of a Triangle
5. Sum of Exterior Angles of a Triangle (Proof)
6. Exterior Angle Theorem of a Triangle
7. Two Exterior Angles at a Vertex are Equal (Proof)
8. Two Exterior Angles are Equal at a Vertex (Quick Proof)

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