The perimeter of a rhombus is 40 m and its height is 5 m.

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Using Rule 12,

Perimeter of rhombus
= 4 × side
∴ 4 × side = 40

⇒ side =	40	= 10m
	4

As, rhombus is a parallelogram of equal sides, its area
= base × height = 10 × 5 = 50m².