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Surface Area of a Sphere

Surface area of the sphere = 4πr2
 

Example:

The surface area of a sphere is cm2. Find the radius of the sphere.
 

Solution:

S.A. = cm2

Let the radius of the sphere be = r cm.
Then,           4
πr2 =

ž      4 × × r2 =
ž                  r = 6 cm ( approx.)
 

 





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