A concave angle is an angle, of a polygon that caves in.
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Reflex angle
It is a hexagon with a reflex angle.
It is the angle between the a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute .
Concave pentagon.
Easy answer: a star icon or the apple logo are examples of what a concave polygon looks like.A concave polygon has 1 interior angle greater than 180 degrees.you can see an example on:http://en.wikipedia.org/wiki/Convex_and_concave_polygonshttp://www.mathopenref.com/polygonconcave.html