Question : The radius of a sphere is 3.5 cm. What is the total surface area of the sphere?
Option 1: 154 cm2
Option 2: 77 cm2
Option 3: 231 cm2
Option 4: 188 cm2
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Correct Answer: 154 cm 2
Solution : The total surface area of a sphere ($A$), where $r$ is the radius of the sphere. $ A = 4\pi r^2 $ Substituting $r = 3.5$ cm into the formula, $ A = 4\pi (3.5)^2 = 4×\frac{22}{7}\times 12.25 =154\text{ cm}^2 $ Hence, the correct answer is 154 cm 2 .
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Question : Find the surface area of a sphere whose radius is 3.5 cm. Use $(\left.\pi=\frac{22}{7}\right)$.
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