Precalc and Trigonometry

[dancingpiglets]

A cow is tethered to one corner of a square barn,
15 feet by 15 feet, with a rope 170 feet long.

What is the maximum grazing area for the cow?

 

[lev888]

A cow is tethered to one corner of a square barn,
15 feet by 15 feet, with a rope 170 feet long.

What is the maximum grazing area for the cow?

Start with a drawing - the barn, the area the cow can reach. The cow itself is optional.