The radius of the circle in which the sphere \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+2x-2y-4z-19=0\] is cut by the plane \[x+2y+2z+7=0\], is
AIEEE Solved Paper-2003
A) 1
B)2
C)3
D)4
Correct Answer:
C
Solution :
Equation of sphere is Centre of the sphere is (-1, 1, 2) and radius Equation of plane is Length of the perpendicular from centre O on the plane is In