Question

tively.
An iron pipe 20 cm long has external diameter equal
to 25 cm. If the thickness of the pipe is 1 cm, find
the whole surface of the pipe.​

Answer 1

Answer:

C.S.A of cylinder

Step-by-step explanation:

Thick =1cm External diameter=25cm .Internal diameter =25-1=24 cm.Now 2πrh=2×22/7/12×20