Never, honey. Just because a parallelogram has those fancy opposite sides that are parallel, doesn't mean it automatically becomes a rectangle. Rectangles have those nice right angles, while parallelograms can be all slanted and sassy. So, keep those shapes in check, darling.
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Parallelograms are a type of quadrilateral with opposite sides that are parallel. A rectangle is a specific type of parallelogram with four right angles. Therefore, all rectangles are parallelograms, but not all parallelograms are rectangles. So the statement "All parallelograms are rectangles" is false.
Oh, what a happy little question! Parallelograms and rectangles are like old friends on a beautiful painting. Remember, all rectangles are parallelograms, but not all parallelograms are rectangles. It's like having different shapes in your painting, each one unique and special in its own way.
Sometimes they are.
sometimes
never
Some polygons are rectangles. The vast majority are not.
Some parallelograms are squares - the ones which are equiangular (have equal angles) and are equilateral (have equal side lengths). All squares are parallelograms, but only some parallelograms are squares.