Question : Find the surface area of a sphere whose radius is 3.5 cm. Use $(\left.\pi=\frac{22}{7}\right)$.
Option 1: 154 cm2
Option 2: 152 cm2
Option 3: 146 cm2
Option 4: 160 cm2
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Correct Answer: 154 cm 2
Solution :
Given, Radius = 3.5 cm
The surface area of the sphere = $4\pi r^2$, where $r$ is the radius of the sphere.
⇒ Surface area = $4\times \frac{22}{7}\times 3.5\times 3.5=4\times 22\times 0.5\times 3.5=$ 154 cm
2
Hence, the correct answer is 154 cm
2
.
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