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A plane passes through a fixed point `(a ,b ,c)dot` The locus of the foot of the perpendicular to it from the origin is a sphere of radius a. `1/2sqrt(a^2+b^2+c^2)` b. `sqrt(a^2+b^2+c^2)` c. `a^2+b^2+c^2` d. `1/2(a^2+b^2+c^2)`

A

`sqrt(a^2+b^2+c^2)`

B

`1/2sqrt(a^2+b^2+c^2)`

C

`a^2+b^2+c^2`

D

None of these

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The correct Answer is:
B
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