If the diameter of a sphere is 3.5 cm, then what is the total surface area of the sphere?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 38.5 cm2
Given:
Diameter = 3.5 cm
Radius = 3.5/2 = 1.75 cm
Formula used:
Total surface area of sphere = 4πr2 ---- (1)
Calculations:
Using equation (1), we get
⇒ Total surface area = 4 × (22/7) × (1.75)2
⇒ 38.5 cm2