It has no particular name but it looks like a house.
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It is a polygon. It has four sides of equal length. It has four angles which are all right angles. Its two diagonals bisect each other at right angles. Its area is the square of the length of its side.
If measured on the inside of the polygon, the it is an interior angle.
The sum of the exterior angles of any regular polygon is 360°
A rectangle is a four sided polygon with four right angles and two pairs of parallel side. [Equal sides is not required since it is implied by parallel and right angles].
A cow