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A regular pentagon has 5 equal sides and 5 equal inside angles that add up to 540 degrees
A pentagon has 5 sides and 5 interior angles that add up to 540 degrees
It has five of them. Only the interior angles can add up to 540°.
It has 8 equal sides It has 8 interior angles that add up to 1080 degrees It has 8 exterior angles that add up to 360 degrees It can have 8 equal sides or 8 sides that are not all equal
Its 5 interior angles add up to 540 degrees