Geometry : The most general fact
Did you know : All rectangles are parellelogram but all parallelograms are not rectangle !!
Parallelogram has opposite sides equal and parallel. Rectangle also has opposite sides equal and parallel. The difference between the two is that sides of rectangles form 90 degrees while that of parallelogram don’t. So rectangle can be called a parallelogram because they fulfill all the requirement of a parallelogram but parallelogram cannot be called rectangle.
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