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Spheres A and B have their radii 40 cm and 10 cm respectively. Ratio of surface area of A to the surface area of B is :
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- 1 : 16
- 4 : 1
- 1 : 4
- 16 : 1
- 1 : 16
Correct Option: D
| Surface area of B |
| = | = | ||
| 4πr2² | r2² |
Where r1 and r2 are radii of spheres A and B respectively.
| = | = | ||
| 10 × 10 | 1 |
⇒16 : 1
