Question

the outer and inner radii of hollow sphere are 12 cm and 10 cm .find its volume

Answer 1

Volume of the hollow sphere = $4/3 \pi [ r^2_{1} - r^2_{2} ]$
here r1 = 12 and r2 = 10.
so volume = 4/3 * 22/7 * [ 144 - 100 ] 
= 4/3 * 22/7 * 44
= 138.3809 cubic cm.

Answer 2

138.4 is the volume for this