A) \[{{u}^{2}}+{{v}^{2}}+{{w}^{2}}={{d}^{2}}\]
B) \[{{u}^{2}}+{{v}^{2}}+{{w}^{2}}>d\]
C) \[{{u}^{2}}+{{v}^{2}}+{{w}^{2}}<d\]
D) \[{{u}^{2}}+{{v}^{2}}+{{w}^{2}}<{{d}^{2}}\]
Correct Answer: B
Solution :
[b] Equation \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+2ux+2vy+2wz+d=0\] Represent a real sphere if \[{{u}^{2}}+{{v}^{2}}+{{w}^{2}}>d\]
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