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Câu hỏi: Trong không gian $Oxyz$, phương trình mặt cầu tâm $I\left( 2;1;2 \right)$ có bán kính bằng $3$ là
A. ${{\left( x+2 \right)}^{2}}+{{\left( y+1 \right)}^{2}}+{{\left( z+2 \right)}^{2}}=3.$
B. ${{\left( x+2 \right)}^{2}}+{{\left( y+1 \right)}^{2}}+{{\left( z+2 \right)}^{2}}=9.$
C. ${{\left( x-2 \right)}^{2}}+{{\left( y-1 \right)}^{2}}+{{\left( z-2 \right)}^{2}}=9.$
D. ${{\left( x-2 \right)}^{2}}+{{\left( y-1 \right)}^{2}}+{{\left( z-2 \right)}^{2}}=3.$
A. ${{\left( x+2 \right)}^{2}}+{{\left( y+1 \right)}^{2}}+{{\left( z+2 \right)}^{2}}=3.$
B. ${{\left( x+2 \right)}^{2}}+{{\left( y+1 \right)}^{2}}+{{\left( z+2 \right)}^{2}}=9.$
C. ${{\left( x-2 \right)}^{2}}+{{\left( y-1 \right)}^{2}}+{{\left( z-2 \right)}^{2}}=9.$
D. ${{\left( x-2 \right)}^{2}}+{{\left( y-1 \right)}^{2}}+{{\left( z-2 \right)}^{2}}=3.$
Đáp án C.