"A rectangle is a parallelogram with one right angle". Doesn't sound sensible when you read it but a little thought will show that if one angle in a parallelogram is 90o, then the other three must all be 90o also.
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A square is a special case of a rectangle which in turn is a special case of a parallelogram
A square is a special case of a rhombus. A parallelogram is not a rhombus.
Yes, that's a true statement.A rhombus is a special case of a parallelogram.
A square is a special case of a parallelogram.
A rhombus is a special case of a parallelogram where all side are the same length.