Question

find the volume and surface area of sphere of radius 2.1 cm​

Answer 1

r = 2.1 cm

Volume = 4/3(πr³)

= 4/3(3.14×( 2.1)³)

= 38.77 cm³

Area = 3πr²

= 3×3.14 × ( 2.1)²

= 41.54cm²

Answer 2

Given:-

• Radius of Sphere = 2.1cm

To Find:-

• Volume and surface area of sphere

Formula Used:-

• ${\boxed{\bf{Volume\:of\:Sphere=\dfrac{4}{3}\pi r^3}}}$

• ${\boxed{\bf{Surface\: Area\:of\:Sphere=4\pi r^2}}}$

Solution:-

Firstly,

$\sf :\implies\:Volume\:of\:Sphere=\dfrac{4}{3}\pi r^3$

$\sf :\implies\:Volume\:of\:Sphere=\dfrac{4}{3}\times\dfrac{22}{7}\times2.1\times2.1\times2.1$

$\sf :\implies\:Volume\:of\:Sphere=4\times22\times0.1\times2.1\times2.1$

$\sf :\implies\:Volume\:of\:Sphere=38.808\:cm^3$

Now,

$\sf :\implies\:Surface\: Area\:of\:Sphere=4\pi r^2$

$\sf :\implies\:Surface\: Area\:of\:Sphere=4\times\dfrac{22}{7}\times2.1\times2.1$

$\sf :\implies\:Surface\: Area\:of\:Sphere=4\times22\times0.3\times2.1$

$\sf :\implies\:Surface\: Area\:of\:Sphere=55.44\:cm^2$

Hence The Volume and Surface Area of Sphere is 38.808cm³ and 55.44cm² respectively.

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