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A parallelogram is a rhombus if and only if the diagonals are perpendicular
A parallelogram doesn't necessarily have any perpendicular sides, but it can. If it has one single 90-degree angle, then it has four of them, and it's a rectangle or square. A parallelogram without perpendicular sides is a rhomboid or rhombus.
if the diagonals of parallelogram become Perpendicular then the figure is said to be rhombus......
The single altitude of a parallelogram is its perpendicular height
The area of a parallelogram with base 18cm and perpendicular height 18cm is 324 cm2