Question

find the surface area and volume of spheres of the following radii.
(1) 4 cm
(2) 9 cm
(3) 3.5 cm

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Answer 1

First surface area of all :-

$(1) \: 4cm \\ = 4\pi {r}^{2} \\ = 4 \times \frac{22}{7} \times 4 \times 4 \\ = 201.14 {cm}^{2}$

$(2) \: 9 \: cm \\ = 4 \times \frac{22}{7} \times 9 \times 9 \\ = 1018.28 {cm}^{2}$

$(3) \: 3.5cm \\ 4 \times \frac{22}{7} \times 3.5 \times 3.5 \\ = 154 {cm}^{2}$

volume ka formula hai

$= \frac{4}{3} \pi {r}^{3}$

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Answer 2

Here your answer

hope this help you