Some parallelograms are rectangles; all rectangles are parallelograms.
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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 is a four-sided shape, a parallelogram. Since a rhombus is a parallelogram then it is also a rectangle in a sense. Along with a square, it is a type of rectangle.
A rectangle is a parallelogram but a parallelogram is not a rectangle. A rectangle needs all 90 degree angles but a parallelogram dosnt.
When all 4 corners are right angles. A parallelogram has two pairs of parallel sides. A rectangle has two pairs of parallel sides; therefore a rectangle is a parallelogram. A rectangle also has four 90° angles; a parallelogram does not necessarily have four 90° angles, therefore a parallelogram may, or may not, be a rectangle.
A rectangle is a parallelogram but a parallelogram need not be a rectangle and so they are not the same.