A metal pipe is 28 cm long and has an external radius of 2.1 cm. If its thickness is 0.7 cm, then find the whole surface area of the pipe.
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2
given that,
external diameter = 8 cm
external radius = R =4 cm
thickness= 1 cm
so, internal diameter= (8-1) cm = 7 cm
internal radius = r = 3.5 cm
volume of iron = π(R²- r²)h
=> 247.5 cm³
weight of iron = 247.5× 8 = 1980 gram or 1.98 kg
Answered by
3
Answer:
2457.5cm^3
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#Be brainly..........:)
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