A) \[18\text{ }cm\]
B) \[\text{20 }cm\]
C) \[\text{28 }cm\]
D) \[\text{30 }cm\]
Correct Answer: B
Solution :
(b): \[\left. \begin{align} & Side\,\,of\,\,1st\,\,square\,=4cm:\,Area=16c{{m}^{2}} \\ & Side\,\,of\,\,2nd\,\,square\,=3cm:\,Area=9\,c{{m}^{2}} \\ \end{align} \right\}\begin{matrix} Area\,\,of\,3rd\,square\,=25c{{m}^{2}} \\ Its\,\,perimeter=4\times 5\,cm=20cm \\ \end{matrix}\]
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