A cast-iron pipe has an external diameter of 75 mm. If it is 4.2 m long. Find the area of the outer surface.
Answers
Answered by
6
Answer:
external diameter 75mm.
radius = 75\2=37.5
=37.5/10cm=3.75
length of pipe h
4.2m =4.2m×100cm =420
area of the outer surface is 2πrh
2×22/7×3.75×420=9900cm^2
Answered by
1
External diameter 75mm.
radius = 75\2=37.5
=37.5/10cm=3.75
length of pipe h
4.2m =4.2m×100cm =420
area of the outer surface is 2πrh
2×22/7×3.75×420=9900cm^2
Similar questions