Question

If the radius of a sphere is 3a, find its surface area. with full process​

Answer 1

Answer:

$area = 4\pi {r}^{2}$

$r = 3a$

$a = 4 \times \frac{22}{7} \times ({3a)}^{2}$

$a = \frac{792a {}^{2} }{7}$

$a = 113.14a {}^{2}$

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