The curved surface area of a sphere is 9856 cm2 , find its diameter in m.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 0.56
Curved surface area of sphere = 4 × π × r²
4 × (22/7) × r² = 9856
r² = 9856 × 7 ÷ (4 × 22)
r² = 68992 ÷ 88
r² = 784
r = √784 = 28 cm
Diameter = 2 × r = 2 × 28 = 56 cm = 56 ÷ 100 = 0.56 m