The volume of a cylinder of radius 14cm is 210cm3. What is the curved surface area of the cylinder?
-
A.
15cm2 -
B.
30cm2 -
C.
616cm2 -
D.
1262cm2
Correct Answer: Option B
Explanation
(V = pi r^2 h\
210 = frac{22}{7} times 14^2 times h \
h = frac{210}{22 times 28})
Curved surface area (= 2rpi h\
= 2 times frac{22}{7} times 14 times frac{210}{22 times 26} = 30cm^2)