Question

The outer diameter of a metallic pipe is 18 cm and the thickness of the pipe is 4 cm find th surface area of the metallic pipe

Answer 1

Answer:

54cm is the ans

Step-by-step explanation:

18 multiplyed by 4 =54

Answer 2

Given outer diameter of metallic pipe =18cm

(R) outer radius =9cm

Thickness =2cm

Then inner radius = 9−2=7cm

Height of pipe = 4cm

Pipe has a shape of cylinder then

Surface area of outer pipe = 2πRh = 2π×9×4

Outer area = 72πcm2

Inner surface area of pipe =2πrh=2×π×7×456π2cm

Now surface area of metallic pipe =72π−56π

Area =

Surface area of metallic pipe is =16πcm2

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