The distance between the opposite vertices is the same.
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It is a right angled parallelogram.
A quadrilateral and a rectangle are the same so.............
A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!
All the angles being 90o. A rectangle, like a parallelogram, has two pairs of parallel sides and opposite angles equal; however a rectangle also requires that the angles are all 90o (right angles) unlike a general parallelogram.
All four of the angles of a rectangle (and of squares) are right angles.(Its name comes from this : rect-angle.)