To find second side of park we can use formula for area of rectangle.
ITs
A=a*b
Where A is area and a ,b area sides of it/
We can convert our area
A=a*b /:a divide both sides by a (its no matter which side we assume to be 83)
[tex] \frac{A}{b} =a[/tex]
Now we can substitute to our formula.
[tex]a= \frac{6889}{83}=6889:83=83 [/tex] - its second side and its our answer.