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خطا

حجم کره $ = \frac{4}{3}\pi {r^3} = \frac{4}{3}\pi {(3a)^3} = \frac{4}{3}\pi  \times 27{a^3} = 36\pi {a^3}$ $\mathop {\cancel{{36}}}\limits^1 \cancel{\pi }{a^3} = \mathop {\cancel{{72}}}\limits^2 \cancel{\pi } \Rightarrow {a^3} = 2 \Rightarrow a = \sqrt[3]{2}$