The area of a rhombus is $150 {c m}^{2}$ . The length of one of its diagonals is $10 c m$ . The length of the other diagonal is:

25 c m

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30 c m

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35 c m

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40 c m

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Solution

The correct option is A $30 c m$
Area of rhombuses $= \frac{1}{2} (d_{1} \times d_{2})$
$150 = \frac{1}{2} (10 \times d_{2})$
$\frac{300}{10} = d_{2} \Rightarrow d_{2} = 30 c m$

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