Question

what kind of polygon is this? concave convex

Explanation:

A convex polygon is a polygon where all interior angles are less than 180 degrees and all vertices point outwards. A rectangle (the given polygon) has all interior angles equal to 90 degrees (less than 180) and all vertices point outwards, so it is a convex polygon. A concave polygon has at least one interior angle greater than 180 degrees and at least one vertex pointing inwards, which is not the case here.

Answer:

convex