Question

Q13. The volume of a hemisphere is 2425 1/2
cm3. Find its curved surface area. [Use = 22/7 ]

Answer 1

Solution:-
Given : Volume of hemisphere = 2425 1/2 cu cm or 2425.5 cu cm.
Volume of hemisphere = 2/3πr³
2425.5 = 2/3*22/7*r³
r³ = (2425.5*21)/44
r³ = 50935.5/44
r³ = 1157.625
r = 10.5 cm
Now,
Curved Surface Area of hemisphere = 2πr²
= 2*22/7*10.5*10.5
= 693 sq cm
CSA of hemisphere is 693 sq cm.
Answer.