Question 195091
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Given, Width (W) = 40 meters when Perimeter (P) = 210 meters. 


*The chain link enclosed all sides of the field.

Find, Length (L) = ?


We know for a Rectangle, {{{P[R]=2L+2W}}}
Substituting,
{{{210=2L+2(40)}}}
{{{210=2L+80}}}
{{{2L=210-80=130}}}
{{{cross(2)L/cross(2)=cross(130)65/cross(2)}}}
<font color=blue>L = 65 meters</font>, Answer


Check,
{{{P=2L+2W}}}
{{{210=2(65)+2(40)}}}
{{{210=130+80}}}
{{{210m=210m}}}


Thank you,
Jojo</font>