math

A cow is tethered by a piece of rope 50 meters long to the side of a rectangular barn. The rope is fastened to a hook (on the barn) that is located 20 meters from the corner along the longest side of the barn which measures 70 meters by 20 meters. Over how much ground (outside of the barn) can the cow graze? I have no idea what I am supposed to do, all I know is that the circle , when drawn, with the rope being the radius, the area of the circle is 2500pi. I'm not sure where to go from there. Please help, this is an emergency, thank you.

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