A ball of radius 1 cm is put into a cylindrical pipe so that it fits inside the pipe

A ball of radius 1 cm is put into a cylindrical pipe so that it fits inside the pipe. If the length of the pipe is 14 m, what is the surface area of the pipe?

  1. 2200 square cm
  2. 4400 square cm
  3. 8800 square cm
  4. 17600 square cm

Answer

As the ball fits into cylindrical pipe, radius of ball is same as the radius of pipe.

Radius of pipe = 1 cm

Length or height of pipe = 14 m = 1400 cm

Surface Area of cylinder = 2πrh

Surface Area = 2 × 22/7 × 1 × 1400

Surface Area = 8800 cm2

The correct option is C.