A metallic pipe is 0.7 cm thick . Inner radius of the pope is 3.5 cm and length is 5 DM . Find its total surface area .
[Hint: T.S.A = inner surface area + outer surface area + area of two rims ]
If you know the answer , pls reply & text the answer ( step by step ).
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Answer:
Thickness of pipe = h = 0.7 cm
Inner radius = r = 3.5 cm
External radius = R = r + h = 3.5 + 0.7 = 4.2 cm
Length = 5 dm = 50 cm
Total surface area of cylinder or pipe = 2∏(r + R) (h + R - r)
= 2 × 22/7 × (3.5 + 4.2) (50 + 4.2 - 3.5)
= 2453.88 cm2
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