Question

(b) The radius of the sphere is 7 cm. the surface area of the sphere is
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Answer 1

Answer:

$radius = 7$

$surface \: area \: was \: = 4\pi {r}^{2}$

$4 \times \pi \times {7}^{2}$

$\pi \times 196$

$\frac{22}{7} \times 196$

$22 \times 63$

$11 \times 126$

$1386 {cm}^{2}$

Answer 2

Given that

Radius of sphere is 7cm

To find

Surface area of sphere

Solution

Let

r is radius of sphere

a is area of sphere

As we know that

$surface \: area \: of \: sphere = 4 \times \pi \times {r}^{2}$

put

$\pi = \frac{22}{7}$

we get

$a = 4 \times \frac{22}{7} \times 7 \times 7$

by multiplication we get

$a = 4 \times 22 \times 7$

$a = 616 {cm}^{2}$

hence area of sphere is 616${cm}^{2}$