Question

Q39: If each edge of a cube is doubled, its surface are will increase
A
O two times
three times
four times
five times​

Answer 1

Let the side of cube = 2a

Surface area = 6a²

Surface area = 6 ( 2a )²

Surface area = 6 × 4a²

Surface area = 24a²

Original area= 24a²

New area = 6a²

Increase in area = 24a²/6a² = 4

Option 3) Four times is correct ✅✅