Correct Answer: Option C
ধরি, প্রস্থ=x, তাহলে দৈর্ঘ্য = \[\frac{{3x}}{2}\]
\[\begin{array}{l}
x \times \frac{{3x}}{2} = 216\\
= > \frac{{x \times 3x}}{2} = 216\\
= > 3{x^2} = 432\\
= > {x^2} = 144\\
= > x = 12
\end{array}\]
তাহলে, দৈর্ঘ্য = \[\frac{{3 \times 12}}{2} = 18\]
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