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Find the surface area of a sphere of radius 10.5 cm - CBSE Class 9 - Mathematics

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Question

Find the surface area of a sphere of radius 10.5 cm

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

 

Solution

Radius (r) of sphere = 10.5 cm

Surface area of sphere = 4πr2

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

`=(4xx22/7xx10.5xx10.5)cm^2`

= (88 x 1.5 x 10.5)cm2

= 1386 cm2

Therefore, the surface area of a sphere having radius 10.5cm is 1386 cm2.

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APPEARS IN

 NCERT Solution for Mathematics Class 9 (2018 to Current)
Chapter 13: Surface Area and Volumes
Ex. 13.40 | Q: 1.1 | Page no. 225

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Solution Find the surface area of a sphere of radius 10.5 cm Concept: Surface Area of a Sphere.
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