360 total
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When all the vertices of a plane quadrilateral are exactly equal to 90 degrees it is is called a rectangle and, if all its sides are of equal length, that rectangle is called a square. So when a plane quadrilateral has all its vertices exactly equal to 90 degrees, but it does not have all its sides equal in length, it must be a rectangle but not a square.
A rectangle
Yes. A square is a rectangle and a rectangle is a quadrilateral.
All four angles in a rectangle are 90 degrees. In any quadrilateral the sum of all four angles is 360 degrees.
Any parallelogram that is not also a rectangle.