Find the radius of a sphere whose surface area is 154 cm2
-
A.
7.00 cm -
B.
3.50 cm -
C.
3.00 cm -
D.
1.75 cm
Correct Answer: Option B
Explanation
| 154 = 4 x | 22 | x r2 |
| 7 |
| 154×7 | = r2 |
| 4×22 |
√ 49/4 = r
| 7 | = r |
| 2 |
∴r = 3.50
| 154 = 4 x | 22 | x r2 |
| 7 |
| 154×7 | = r2 |
| 4×22 |
√ 49/4 = r
| 7 | = r |
| 2 |
∴r = 3.50