Question 42190
{{{drawing(300,300,-55,55,-55,55,
circle(0,0,50),
line(0,0,20,0),
line(20,10,20,0),
line(0,0,0,10),
line(0,10,20,10),
locate(0,0,A),
locate(20,0,B),
locate(20,10,C),
locate(0,10,D)
)}}}


The barn is represented by the rectangle ABCD in the figure; AB = CD = 20 ft and BC = DA = 10 ft.
The cow is tied to the corner with a 50 ft rope.
So it can graze over the area of the circle shown (centre of circle at corner point A and radius of circle is 50 ft).
It is evident from the figure that the cow will be able to graze over the entire barn (area = 20 x 10 = 200 sq ft).