If each side of a cube is tripled , then the percentage change in the surface area is:
Answer & explanation
Correct answer: option 3
Surface area of cube = 6a2
After triipling each side of the cube
new surface area = 6 (3a)2
= 6 (9a2)
= 9 (actual surface area)
Surface area ⇒ Old : New = 1 : 9
Increased percentage = \(\frac{8}{1}\) × 100 = 800%