The Total solution for NCERT class 6-12
Find the volume of a sphere whose surface area is 154 cm2.(Assume ╧А = 22/7)
Let r be the radius ofa sphere.
Surface area of sphere= 4╧Аr2
4╧Аr2┬а=154 cm2┬а(given)
r2┬а=(154├Ч7)/(4 ├Ч22)
r = 7/2
Radius is 7/2 cm
Now,
Volume of the sphere =(4/3) ╧Аr3