Number of sides of a regular polygon from its angle
Find the exterior angle first (180° minus the interior angle), then divide 360° by it.
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A regular polygon has interior angles of 144°. How many sides has it?
Answer: 10
A regular polygon has interior angles of 160°. How many sides has it?
Answer: 18
Each interior angle of a regular polygon is 120°. How many sides does it have?
Answer: 6
Tip: Find the exterior angle first (180° minus the interior angle), then divide 360° by it.
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