Gasoline tank cylindrical

What is the inner diameter of the tank, which is 8 m long and contains 40 cubic cubic meters of gasoline?

Correct answer:

D =  2.5231 m

Step-by-step explanation:

$$\begin{gathered} V=40{\text{m}}^3 \\ l=8\text{ m } \\ S=V\mathrm{/}l=40\mathrm{/}8=5{\text{m}}^2 \\ S=\pi D^2\mathrm{/}4 \\ D=\sqrt{4\cdot S\mathrm{/}\pi }=\sqrt{4\cdot 5\mathrm{/}3.1416}=2.5231\text{ m} \end{gathered}$$

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