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**Area/Quadratic NEED HELP******

The problem is:

A cow is tethered by a piece of rope 50m long. The rope is fastened to a hook located 10 m from the corner of the longest side of a barn measuring 60m by 30 m. Over how much ground can the cow graze.

I add the information above to the diagramp below:

http://www.freeimagehosting.net/uploads/a875067c70.jpg

I try to find the area of the circle then divide it in half (since it half a circle) but i'm not sure so plz help