Mathematics for IGCSE & O level - Similarity (Section 1 - No. 6)
What happens to the surface area of a sphere when its radius is multiplied by 4?
The area is 4 times larger.
The area is 8 times larger.
The area is 16 times larger.
The area is 64 times larger.
Paliwanag
Scaling the radius by 4 changes the surface area by 4²=16.