# Find the Surface Area of a Sphere of Diameter 3.5 m - Mathematics

Find the surface area of a sphere of diameter 3.5 m

["Assume "pi=22/7]

#### Solution

"Radius (r) of sphere "="Diameter"/2=3.5/2=1.75m

Surface area of sphere = 4πr2

=[4xx22/7xx(1.75)^2]m^2

= 38.5 m2

Therefore, the surface area of the sphere having diameter 3.5 m is 38.5 m2.

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#### APPEARS IN

NCERT Class 9 Mathematics Textbook
Chapter 13 Surface Area and Volumes
Exercise 13.4 | Q 2.3 | Page 225