Find the total surface area of solid circular cone with base radius 3cm and slant height 4cm. [Take π = 22/7]
-
A.
37 5/7cm2 -
B.
66cm2 -
C.
75 3/7cm2 -
D.
78 2/7cm2 -
E.
88cm2
Correct Answer: Option B
Explanation
T.S.A of a cone = (pi r^2 + pi rl)
= (frac{22}{7} times 3^2 + frac{22}{7} times 3 times 4)
= (frac{198}{7} + frac{264}{7})
= (frac{462}{7})
= 66 cm(^2)