the perimeter of a rhombus is 160 cm and one of its diagonal has a length of 40 cm . find the area of the rhombus .
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the perimeter of rhombus = 160 cm
length = 40cm
area of the rhombus = 1/2× first daigonal × second daigonal
= 1/2 × 40 × 160
= 3200 cm²
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