Question

plzz answer fast it's urgent

Answer 1

formula of volume of sphere is 4/3×pi×r^3
Let r1 be radius of big circle
r2 be radius of small circle
therefore
(r1) ^3 /( r2) ^3 = 64/27

r1/r2 = 4/3

Formula for surface area of sphere is 4×pi×r^2

so similarly
it will correspond to square of ratio of the radii

S.A 1/ S.A 2 = 16/9

-×-×-×-×


Q6)

volume of cube = (edge)^3
=4^3=64cm^3

since sphere is touching both sides of a cube its
diameter=edge=4cm

radius= 2cm

volume of sphere = 4/3×pi×r^3

4/3×3.14×8=33.5cm^3

Volume of remaining
= 64-33.5
=30.5cm^3