Question : If the diameter of a sphere is 3.5 cm, then what is the total surface area of the sphere?
Option 1: 45.75 cm2
Option 2: 42.6 cm2
Option 3: 38.5 cm2
Option 4: 34.25 cm2
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Correct Answer: 38.5 cm 2
Solution :
The diameter of a sphere = 3.5 cm
Radius, $r$ = $\frac{3.5}{2}$ = 1.75 cm
The surface area of the sphere
= $4 \pi r^2$
= $4 × \frac{22}{7} × 1.75^2$
= $38.5$ cm
2
Hence, the correct answer is 38.5 cm
2
.
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