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Is this shape a concave polygon?
A.
B.
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Explanation
The correct answer is “Yes.”
Remember:

 A concave polygon has at least 1 internal angle greater than 180°. A concave polygon also has an indent like a cave.

 

The given shape has 1 internal angle that is greater than 180° and the shape is indented (as shown with the red color).

                                                         

Hence, this polygon is a concave polygon

 

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