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Câu hỏi: Thể tích khối cầu bán kính $3\ \text{cm}$ bằng
A. $36\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
B. $108\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
C. $9\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
D. $54\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
Ta có: $V=\dfrac{4\pi {{r}^{3}}}{3}=\dfrac{4\pi {{3}^{3}}}{3}=36\pi \left( c{{m}^{3}} \right).$
A. $36\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
B. $108\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
C. $9\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
D. $54\pi \ \left( \text{c}{{\text{m}}^{3}} \right)$.
Ta có: $V=\dfrac{4\pi {{r}^{3}}}{3}=\dfrac{4\pi {{3}^{3}}}{3}=36\pi \left( c{{m}^{3}} \right).$
Đáp án A.