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A concave polygon will always have an interior angle with a measure that is greater than 180 degrees.
A concave polygon has at least one interior angle greater than 180 degrees. A convex polygon has none of those.
It is the regular 7 sided heptagon whose interior angles are greater than the regular 3 sided triangle
Convex : all angles less than 180 degrees. Concave: at least one reflex angle (greater than 180 deg).
An equilateral triangle is the only polygon in which the exterior angle is larger than the interior angle. They are equal in a square and smaller in all regular polygons with more sides,