If each side of a cube is doubled , then the percentage change in the surface area is:
Answer & explanation
Correct answer: option 2
Surface area of cube = 6a2
After doubling each side of the cube
new surface area = 6 (2a)2
= 4 (6a2)
= 4 (actual surface area)
Surface area ⇒ Old : New = 1 : 4
Increased percentage = \(\frac{3}{1}\) × 100 = 300%