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

ConceptSurface Area of a Sphere

#### 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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