Because it is a regular 4 sided quadrilateral having 4 equal sides and 4 equal interior right angles
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A parallelogram with a right angle is a rectangle.
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A rectangle is a special form of parallelogram that has adjacent sides perpendicular to each other or all the inside angles are 90 degrees.
it has 4 equal sides
It could be a rectangle with adjacent sides of 10 metres and 7.8 metres.