
The reason that explains that all rectangles are parallelograms, but all parallelograms are not rectangles.

Explanation of Solution
A quadrilateral in which both pairs of opposite sides are parallel, is a parallelogram.
A rectangle is a parallelogram having 4 right
According to the definition of rectangle, rectangles are always parallelograms.
Also, if the angles of a parallelogram are right angles, then it is a rectangle. If it does not have right angles, it is not a rectangle.
Therefore, parallelograms are sometimes rectangles.
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