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Find the surface area of a sphere of diameter 21 cm - Mathematics

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Find the surface area of a sphere of diameter 21 cm

`["Assume "pi=22/7]`

 

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Solution

`"Radius (r) of sphere "= "Diameter"/2 =(21/2)cm=10.5cm`

Surface area of sphere = 4πr2

`=[4xx22/7xx(10.5)^2]cm^2`

= 1386 cm2

Therefore, the surface area of a sphere having diameter 21 cm is 1386 cm2.

Concept: Surface Area of a Sphere
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APPEARS IN

NCERT Class 9 Maths
Chapter 13 Surface Area and Volumes
Exercise 13.4 | Q 2.2 | Page 225

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