there are 4 of them and the sum of the exterior is 360 and the sum of the interior is 4(2)180=360 also. Depending on which one you pick, the individual angles may be 90 or greater or less than 90 Doctor Chuck
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not always
Its basically a hierarchy just for quadrilaterals.
Not all quadrilaterals are rectangles. Some quadrilaterals are rectangles, and the rest are not. However, all rectangles are quadrilaterals.
They are called Quadrilaterals.
Here are the quadrilaterals you are expected to know about.SquareRhombusRectangleParallelogramTrapeziumKite