Given: A rectangular field with the dimension below:
To Determine: The area of the field in square kilometers
To find the area in square kilometers, first convert the dimension into kilometer.
![\begin{gathered} 1000m=1\operatorname{km} \\ xm=x*(1)/(1000)km \\ l=450m=450*(1)/(1000)km \\ l=0.45\operatorname{km} \end{gathered}]()
![\begin{gathered} w=400m=400*(1)/(1000)km \\ w=0.4\operatorname{km} \end{gathered}]()
The area of a rectangle is given by the formula is
![A_{\text{RECTANGLE}}=\text{length}* width]()
Since the field is a rectangle, then the area of the field would be
![\begin{gathered} A_{\text{RECTANGULAR FIELD}}=length* width \\ A_{\text{RECTANGULAR FIELD}}=0.45\operatorname{km}*0.4\operatorname{km} \\ A_{\text{RECTANGULAR FIELD}}=0.18\operatorname{km}^2 \end{gathered}]()
Hence, the area of the rectangular field is 0.18km²