A square
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a right angle has 3 angles on it please.
the polygon would be a square
Polygon
A rectangle is a shape that has more than one right angle. A rectangle has four angles, and two of those angles are always right angles, measuring 90 degrees each. This is a defining characteristic of a rectangle, along with having opposite sides that are equal in length and parallel to each other.
A concave hexagon is one in which one or two interior angles are greater than 180 degrees. With one reflex angle, it would look like a chevron.The browser used here is pretty grim for graphics but, the following is a crude rendition. Ignore the dots - they are required to get the spacing approximately right!_____\.......\..\.......\../......//____/