Argicultural field

Field has a rectangular shape with a width 180 m and circumference 940 m. How many hectares acreage has field?

Correct result:

x =  5.22 ha

Solution:

$$\begin{gathered} a=180 \\ o=940 \\ b=o\mathrm{/}2-a=940\mathrm{/}2-180=290 \\ S=a\cdot b=180\cdot 290=52200 \\ x=S\mathrm{/}100^2=52200\mathrm{/}100^2={\displaystyle \frac{261}{50}}={\displaystyle \frac{261}{50}}\text{ ha}=5.22\text{ ha} \end{gathered}$$

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