Question

the external diameter of an iron pipe is 25 cm and its length is 20 CM if the thickness of the pipe is 1 cm the total surface area of the pipe is what​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Total surface area of the pipe is 201.142 sq.cm.

Step-by-step explanation:

External diameter = 25 cm

External radius R = $\frac{25}{2}=12.5 cm$

Thickness of pipe = 1 cm

Internal radius r = 12.5 cm - 1 cm = 11.5 cm

Length opf pipe = h = 20 cm

Total surface area of pipe = Outer surface area - inner surface area

Total surface area of pipe = $2 \pi R h +\pi R^2 - (2 \pi r h +\pi r^2)$

Total surface area of pipe = $2 \times \frac{22}{7} (12.5) (20) +\frac{22}{7}(12.5)^2 - (2 \times \frac{22}{7} (11.5) (20) +\frac{22}{7}(11.5)^2)=201.142 cm^2$

Hence Total surface area of the pipe is 201.142 sq.cm.

#Learn more:

Find the total surface area of a cylindrical pipe of thickness to CM the external diameter of the pipe is 21 cm and its length is 3m ​

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