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360A triangle is a polygon with three sides and three angles. The sum of the interior angles of a polygon equals 180(n - 2), where n is the number of sides.

180(3 - 2) = 180°

Assuming all the angles in the triangle are congruent, find the measure of one interior angle.

180° ÷ 3 = 60°

If an interior angle equals 60°, then its corresponding exterior angle will equal 120° because the angles are supplementary (their sum is 180°).

120° × 3 = 360°

Therefore, the sum of the exterior angles of a triangle is 360°.

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Q: A figure has 3 sides What is the sum of its exterior angles?

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