More length more harder?

A horse is tied to an outside corner of a 20 foot by 10 foot rectangular barn. What is the maximum area the horse can graze outside the barn, if the rope is 50 foot long. Round of your answer to the nearest integer.

Details and Assumptions:

• The horse does not graze in an area twice, or in other words do not count the overlapping areas twice

• Enter your answer in $ft^2$ units

• Use the approximate value of $\pi$ as 3.14 in your calculations