# Concrete pipe

Concrete pipe is cylindrical with an inner diameter 110 cm and outer 120 cm. Calculate the surface of the concrete pipe, if it is 9 m long.

Result

S =  65.4 m2

#### Solution:

$S = \pi \cdot 9 \cdot (1.1+1.2) + 2 \cdot \dfrac{\pi}{4}(1.2^2-1.1^2) = 65.4 \ m^2$

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