Answer:

Step-by-step explanation:
We are given that
Length of rope=l=160 feet
Radius of quadrant of circle=r=160 feet
We have to find the maximum grazing area of the cow.
We know that
Area of quadrant of circle=
Where 
Using the formula
Area grazed by cow=
Area grazed by cow=
Answer: A x=1/4y^2
Step-by-step explanation:
Because to make sure on the graph is counterclockwise for the vertex for the starting point.