A square 4

A square plot of land has an area of 20.25 ha. The owner fenced it with Three strands of wire. What length of wire did he use for the whole plot?

Correct answer:

x =  5400 m

Step-by-step explanation:

$$\begin{gathered} A=20.25\text{ha}\to {\text{m}}^2=20.25\cdot 10000{\text{m}}^2=202500{\text{m}}^2 \\ A=a^2 \\ a=\sqrt{A}=\sqrt{202500}=450\text{m} \\ o=4\cdot a=4\cdot 450=1800\text{m} \\ x=3\cdot o=3\cdot 1800=5400\text{m} \end{gathered}$$

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