# A variable plane passes through a fixed point $(1,2,3)$. Then the foot of the perpendicular from the origin to the plane lies on

(a) circle

(b) a sphere

(c) an ellipse

(d) a parabola

## 1 Answer

(b) a sphere
answered Nov 7, 2013 by

1 answer

1 answer

1 answer

1 answer

1 answer

1 answer

1 answer