The area of a rhombus is 80 $c m^{2}$ and the length of its one diagonal is 20 cm. The length of the other diagonal of the rhombus is----

8 c m

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12 c m

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10 c m

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None

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Solution

The correct option is A $8 c m$
We know that
Area of rhombus = $\frac{1}{2} \times$ (Product of the diagonals)
or 80 = $\frac{1}{2} \times 20 \times d_{2}$
or $d_{2} = \frac{80 \times 2}{20} c m = 8 c m$

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