It is a quadrilateral but I do not know which one it is:
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3It is a kite. Kites can be concave or convex. – Doug M May 03 '17 at 19:38
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thanks @DougM !! But it isn't right for some reason – May 03 '17 at 19:39
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This can also be called a reflexed polygon. – Cye Waldman May 04 '17 at 19:58
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It is a type of kite (Also known as a deltoid). On the left hand side of the image below is a convex kite, and on the right hand side is a concave kite.
Image by Wikipedia:
A concave kite is sometimes referred as a dart or arrowhead.
projectilemotion
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1Note that a deltoid is sometimes used to refer to a Deltoid curve, but it is also used to refer to a kite. – projectilemotion May 03 '17 at 20:04