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Hey buddy here is your answer
Concave polygons are indefinite in shape and have at least one reflex interior angle—that is, an angle with a measure that is between 180 degrees and 360 degrees exclusive. The number of vertices, edges and sides depends on this angle and are definable...
A. 5 sides, 5 vertices and 5 edges and only one reflex angle.
B. 9 sides, 9 edges and 9 vertices and 2 reflex angles
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-Hermione
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concave pentagon has 5 sides, 5vertices and 5 angles . 1 angle is reflex angle.
concave nonagon has 9 sides, 9 vertices and 9 angles . 2 angles are reflex angles.
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