Question

29. If the length of each edge of a cube is doubled, how many times does its volume become
many times does its surface area become?​

Answer 1

Answer:

A1) of the cube is =6(2a)2=6(4a2)=24a2 sq. unit. So the new surface area of the cube is four times the old surface area. So, the new volume of the cube is eight times the old volume.

Answer 2

Answer:

Surface area of cube=6a2

Is sides of cube is doubled 

New surface area is =6×4a2

Divide 2 by 1

=24a2surfaceareaofcube1surfaceareaofcube2=6a224a2=4times

Surface area increased four times 

Volume of cube= a3 

Volume of new cube= (2a)3

=8a3

Divide 2 by 1

volumeofcubevolumeofnewcube=a38a3

Volume increased 8 times