An oil

An oil drum is cut in half. One-half is used as a water trough. Use the dimensions, length 82cm, width 56cm, to estimate the capacity of the water trough in liters.

Correct answer:

V =  101 l

Step-by-step explanation:

$$\begin{gathered} l=82\text{cm}\to \text{dm}=82:10\text{dm}=8.2\text{dm} \\ w=56\text{cm}\to \text{dm}=56:10\text{dm}=5.6\text{dm} \\ h=l/2=8.2/2=\frac{41}{10}=4.1\text{dm} \\ r=w/2=5.6/2=\frac{14}{5}=2.8\text{dm} \\ V=\pi \cdot r^2\cdot h=3.1416\cdot 2.8^2\cdot 4.1=101\text{l} \end{gathered}$$

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