Question

what are concave and convex polygon

Answer 1

Concave Polygon: If at least one angle of a polygon is more than 180 degree, then it called concave polygon.
Convex Polygon: If each of interior angles of a polygon is less than 180 degree , then it is called convex polygon

Answer 2

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Convex Polygon- In a convex polygon, all the diagonals lie completely inside the polygon

and each of its interior angles is less than 180°.

Concave polygon- In a concave polygon, one or more diagonals lie outside the polygon

and one or more of its interior angles is greater than 180°.

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