An iron pipe 20 cm long has exterior diameter 25 cm. If the thickness of the pipe is 1 cm, then the whole surface area of the pipe?

An iron pipe 20 cm long has exterior diameter 25 cm. If the thickness

1.	An iron pipe 20 cm long has exterior diameter 25 cm. If the thickness of the pipe is 1 cm, then the whole surface area of the pipe?
A.	$$ {3168 cm^{2}}$$
B.	$$ {3186 cm^{2}}$$
C.	$$ {3200 cm^{2}}$$
D.	$$ {3150 cm^{2}}$$
Answer» B. $$ {3186 cm^{2}}$$

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An iron pipe 20 cm long has exterior diameter 25 cm. If the thickness of the pipe is 1 cm, then the whole surface area of the pipe?

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