Surface area of a sphere is 5544 cm². What will be the diameter of sphere?
2021
Surface area of a sphere is 5544 cm². What will be the diameter of sphere?
- A.
42 cm
- B.
21 cm
- C.
28 cm
- D.
35 cm
Attempted by 5 students.
Show answer & explanation
Correct answer: A
Surface area of a sphere = 4πr^2.
Using 5544 = 4 x (22/7) x r^2 gives r^2 = 441, so r = 21 cm.
Diameter = 2r = 42 cm.