Question

A hollow iron pipe 25 cm long has exterior diameter equal to 32 cm. If the thickness of the pipe is 1cm, find the whole surface area of the pipe [ Take pi= 22/7 ]​

Answer 1

Answer:

5066.28 cm^2

Step-by-step explanation:

H= 25 cm

D= 32 cm

R= D/2= 16 cm

T= 1 cm

Inner Radius, r= R-T= 15 cm

Total Surface Area= 2πRH+2πrH+2π(R^2-r^2)

=2π{16*25+15*25+(16*16-15*15)

=2π(400+375+31)

=2*22*806/7

=5066.28 cm^2