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The ratio of the exterior and interior angle of a regular polygon is 2:3. Find the number of sides in the polygon.​

User Sjdowling
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Answer:

5 sides

Explanation:

the sum of the interior angle and exterior angle = 180°

sum the parts of the ratio, 2 + 3 = 5 parts , then

180° ÷ 5 = 36° ← value of 1 part of the ratio

exterior angle = 2 × 36° = 72°

the sum of the exterior angles of a polygon = 360°

since the polygon is regular then the exterior angles are congruent , so

number of sides = 360° ÷ 72° = 5

User Daniel Santana
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