Answer : Option B
Explanation :
$MF#%\text{Given that }\dfrac{2(l + b)}{b} = 5$MF#%
$MF#%=> b = \dfrac{2l}{3}$MF#%
$MF#%\begin{align}
&\text{Substituting the value of b, we get, }l \times \dfrac{2l}{3} = 216\\\\
&\Rightarrow l^2 = \dfrac{3 \times 216}{2} = 3 \times 108 = (3 \times 3) \times 36\\\\
&\Rightarrow l = 3 \times 6 = 18\text{ cm}
\end{align} $MF#%
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