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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.

Q: Why can't a rectangle be a parallelogram?

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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 rectangle will always be a parallelogram.

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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.

you cant because a square, rectangle, and a any other shape with parallel lines is a parallelogram. :)

Yes, a rectangle is a special case of a parallelogram, where each of the 4 angles = 90°

Nope, A rectangle is a type of parallelogram...

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 a tilted rectangle

A rectangle will always be a parallelogram.

A parallelogram is slanted. A rectangle is not.

A trapezium, parallelogram, rhombus, rectangle, square.A trapezium, parallelogram, rhombus, rectangle, square.A trapezium, parallelogram, rhombus, rectangle, square.A trapezium, parallelogram, rhombus, rectangle, square.

A rectangle is a special case of a parallelogram