Question

if the length of the side of a cube is doubled.how much percent will its total surface area increase options-400. 300. 200. 100

Answer 1

{(18x^2)÷(6x^2)}×100=300

Answer 2

Please mark as brain list.....
Side=x
Area=6*x^2
=6x^2
New doubled side=2x
Area=6*(2x)^2
=24x^2
Increase =6x^2-24x^2
=18x^2

%=18x^2/6x^2*100
=300
So answer is 300