Question

an iron pipe 20 cm long has exterior diameter equal to 25 CM if the thickness of the pipe is 1 cm then find the whole surface area of the pipe

Answer 1

Height (h) = 20 cm
Exterior diameter = 25 cm2
exterior radius (R) = 25/2
thickness = 1 cm
internal radius (r)= (25/2)-1
=) (25-2)/2
=) 23/2 cm

TSA of A Hollow cylinder = 2(R+ r)(R-r+h)
=) 2 {(25/2)+(23/2)}{(25/2)-(23/2)+20}
=) 2 {48/2}{(25-23+40)/2}
=) 2 {24}{42/2}
=) 2 {24}{21}
=) 1008 cm²

I hope that my answer will help u.
Like it and give it the brainliest answer if u r satisfied from the answer. Thank u !!!

Answer 2

here is your answer