Internal angles of a plane figure of n sides = (2n - 4) right angles where n is 4 this gives 4 right angles ie 360 degrees
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Any 4 sided shape is a quadrilateral including a a square which is a regular quadrilateral because it has 4 equal sides and 4 equal angles
It is a square that has 4 equal sides and 4 right angles.
This can only be a square: All 4 sides are equal, and all angles are equal to 90 degrees.
It is a rhombus that has 4 equal sides but not 4 equal interior angles
A rhombus