16. * 1 point if any tangent plane to the sphere x +y + z' =9 makes intercepts a,b.c on the axes, then the vhue of ttis (b) 1/2 (d) 1 (a) (c) 1/3 o a o b o o d

16. * 1 point If any tangent plane to the sphere x +y + z' =9 makes intercepts a,b.c on the axes, then the vhue of ttIS (b) 1/2 (d) 1 (a) (C) 1/3 O a O b O O d 10. * I point The angle of the intersection of the sphere x +y + z-2x-4y - 6z + 10 = 0 and x + y +zé - 6x -2y - 2z +2=0 (a) cos(1/3) (C) cos (3/4) (b) cos"(2/3) (d) None of these