Mathematics for IGCSE & O level - Mensuration (Section 10 - No. 15)
If the radius of a sphere is halved, how does the surface area change?
The surface area is halved.
The surface area is quartered.
The surface area doubles.
The surface area is multiplied by 8
Giải thích
Surface Area = 4πr². If r becomes r/2, the surface area becomes 4π(r/2)² = πr² which is one-fourth of the original surface area.