Concave is not a shape, it is the term for when two lines meet facing inwards, rather than outwards (outwards is known as convex)
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No
A geometric star shape is concave. A star that is in the sky is convex.
yes concave is like a cave
no
Depends on a concave what. There can be infinitely many right angles in concave shape that keeps going in and out before returning to its starting point.