If the diameter of a sphere is 3.5 cm, then what is the total surface area of the sphere ?
Answer & explanation
Correct answer: option 3
We know that,
Total surface area = 4πr2
We have,
The diameter of a sphere is 3.5 cm
Total surface area = 4 × \(\frac{22}{7}\) × (\(\frac{3.5}{2}\))2
= 4 × \(\frac{22}{7}\) × \(\frac{12.25}{4}\) = \(\frac{22}{7}\) × 12.25 = 38.5