Question

If the dimensions of a cube are doubled,
by how many times will its surface area
increase?​

Answer 1

Surface area of cube=6a ^2

Is sides of cube is doubled

New surface area is =6×4a ^2

=24a ^2

Now see the attachment- #1

Surface area increased four times

Volume of cube= a ^3

Volume of new cube= (2a) ^3

=8a^3

Now see the attachment- #2