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In short: A rhombus hae four sides of equal measure and a rectangle has
four angles of equal measure.
A rhombus and a rectangle are both parallelograms.
A rhombus is a parallelogram with four equal-length sides. It does
not necessarily have four interior right angles as does a rectangle.
A rectangle is a parallelogram with four interior right angles. It does
not necessarily have four equal-length sides as does a rhombus.
A square is the only figure which is both a rhombus and a rectangle.
Edwin