Mathematics

Find the total surface area of solid circular cone with base radius 3cm and slant…

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)