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Answer: Option A

Explanation:

ধরি, আয়তক্ষেত্রের উচ্চতা = h ব্যাস = 4a বৃত্তের ব্যাসার্ধ = \frac{4 a}{2} =2a সুতরাং, 4 a \times h = {πr}^{2} \Rightarrow 4 ah = π \times {(2 a)}^{2} \Rightarrow h = \frac{π \times 4 a^{2}}{4 a} \Rightarrow h = πa

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