Pipe cross section

The pipe has an outside diameter 1100 mm and the pipe wall is 100 mm thick. Calculate the cross section of this pipe.

Correct answer:

S =  6361.7251 cm²

Step-by-step explanation:

$$\begin{gathered} D=1100\text{ mm } \\ r=D\mathrm{/}2=1100\mathrm{/}2=550\text{ mm } \\ T=100\text{ mm } \\ {r}_1=r-T=550-100=450\text{ mm } \\ {S}_1=\pi \cdot r_1^2=3.1416\cdot 450^2\doteq 636172.5124{\text{mm}}^2 \\ S=S_1\mathrm{/}10^2=636172.5124\mathrm{/}10^2=6361.7251{\text{cm}}^2 \end{gathered}$$

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