Question

$\huge \color{orange}{\underline{Question}}$
A spherical Valve of a tank is 21 CM in diameter. Calculate the surface area and volume.​

Answer 1

$\sf \huge \color{Green}{\underbrace{Answer} }:$

Surface area = 1386cm²

Volume = 4851cm³

$\sf \huge \color{Green}{\underbrace{Solution} }:$

Radius = $\frac{21}{2} cm$

$\large \color{red} \boxed{\sf Surface \: area \: of \: sphere = 4πr² } \\ \\ = 4×\frac{22}{7} × \frac{21}{2} ×\frac{21}{2} \\ \\ \sf \implies \boxed{1386cm²}$

$\large \color{red} \boxed{\sf Volume \: of \: sphere = \frac{4}{3}πr³ } \\ \\ = \frac{4}{3} × \frac{22}{7} × \frac{21}{2} × \frac{21}{2} × \frac{21}{2} \\ \\ \implies \boxed{4851cm³}$

Answer 2

Answer:

Step-by-step explanation:

d = 21 cm

r = 21/2

surface area of sphere = 4πrsquare

= 4×22/7×21/2×21/2

=1386 cm square

volume of sphere =4/3πrcube

=4/3÷22/7×21/2×21/2×21/2

=4851 cm cube