The radius of a sphere is 3.5 cm. What is the total surface area of the sphere?
Answer & explanation
Correct answer: option 1
We know that,
The total surface area of a sphere = 4πr2.
Radius of a sphere = 3.5 cm
Total surface area = 4 × \(\frac{22}{7}\) × (3.5)2 = 154 cm2