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Your question needs more information. Convex means a surface curves out, while concave means the surface curves in.
Concave is not a shape, it is the term for when two lines meet facing inwards, rather than outwards (outwards is known as convex)
it means that part of the shape is rounded outwards
angles that face outwards
A convex polygon is defined as a polygon with all its interior angles less than 180°. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. Think of it as a 'bulging' polygon. A triangle (3-gon) is always convex.