Q1. By how many % will the s.a of the cube increase if each side is doubled?

Q2. A circle of radius 7cm is divided into two sectors by cutting 120 degree sector from the centre.The 2 sectors are used to form 2 cones of l=7cm, find the ratio of bigger cone to smaller cone?

Q3. If a=csa, b=tsa, v=vol then express v in terms of a & b. (for a cuboid)

Q4. Find 1/[(2^2)-1]+1/[(4^2)-1]+1/[(6^2)-1]......1/[(20^2)-1]

Show the statements an solutions as well.

Thanks