Q10Multiple choiceExercise 13.1
The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is
- (A)1 : 4
- (B)1 : 3
- (C)2 : 3
- (D)2:1
Show answer
(A) 1 : 4