Find the surface area of a sphere of diameter 14 cm - Mathematics

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Find the surface area of a sphere of diameter 14 cm

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

 

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Solution

`"Radius (r) of sphere "= "Diamete"/2 = (14/2)cm = 7cm`

Surface area of sphere = 4πr2

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

= (88 x 7)cm^2

= 616cm^2

Therefore, the surface area of a sphere having diameter 14 cm is 616 cm2.

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Chapter 13: Surface Area and Volumes - Exercise 13.4 [Page 225]

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NCERT Mathematics Class 9
Chapter 13 Surface Area and Volumes
Exercise 13.4 | Q 2.1 | Page 225

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