Because a rectangle has 4 equal interior right angles whereas a parallelogram does not have 4 equal interior angles but they are both in the same class as 4 sided quadrilaterals.
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A rectangle cannot be a parallelogram because a parallelogram has opposite sides that are parallel and equal in length, while a rectangle has all angles equal to 90 degrees. Thus, a rectangle is a specific type of parallelogram that has the additional property of having all angles equal to 90 degrees.
A rectangle is a parallelogram but a parallelogram is not a rectangle. A rectangle needs all 90 degree angles but a parallelogram dosnt.
A rectangle is a parallelogram but a parallelogram need not be a rectangle and so they are not the same.
A parallelogram is not a rectangle. However, a rectangle is a parallelogram because it has two pairs of opposite sides that are parallel
A rectangle is a parallelogram, but a parallelogram is not necessarily a rectangle. This is because a parallelogram can be so many other things, like a rhombus or a square.
A parallelogram is slanted. A rectangle is not.