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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