Test your understanding of exterior angles in a triangle.

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

Question 1

What is the sum of the exterior angles of a triangle?

A) 180°
B) 270°
C) 360°

Question 2

Two exterior angles are 100° and 120°.

Find the third angle.

A) 120°
B) 140°
C) 160°

Question 3

Exterior angles are:

90°, 150°, and x

Find x.

A) 90°
B) 110°
C) 120°

Question 4

Exterior angles are:

x, x, and 120°

Find x.

A) 100°
B) 110°
C) 120°

Question 5

Exterior angles are:

x, 2x, and x

Find x.

A) 60°
B) 90°
C) 120°

Answers

1️⃣ C – 360°

2️⃣ B – 140°

3️⃣ C – 120°

4️⃣ C – 120°

5️⃣ B – 90°

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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