Question

Define is Concave polygon?

Answer 1

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here is your answer.

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The polygon that is non -convex and always have at least one reflex interior angle is known as concave polygon.

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Answer 2

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A concave polygon is defined as a polygon with one or more interior angles greater than 180°. It looks sort of like a vertex has been 'pushed in' towards the inside of the polygon. Note that a triangle (3-gon) can never be concave. A concave polygon is the opposite of a convex polygon. See Convex Polygon.
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A line drawn through a concave polygon, depending on exactly where you draw it, can intersect the polygon in more than two places. In the figure on the right, the line cuts the polygon in 4 places. You can also see that the line can divide the polygon into more than two pieces, here three.

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