SSAT Math Question 381: Answer and Explanation

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Question: 381

9. What is the sum of the exterior angles of an equilateral triangle?

A. 60°
B. 90°
C. 120°
D. 240°

Correct Answer: E

Explanation:

The sum of the external angles of any triangle, including an equilateral triangle, is always 360°.

Draw an equilateral triangle and write in 60° at each vertex. Extend a line at each vertex to create an exterior angle. As there are 180° in a line, each exterior angle is 120°. Therefore, the sum is 360°.

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