Problem
1984 AHSME Problem 4
A rectangle intersects a circle as shown: AB = 4, BC = 5 and DE = 3. Then EF equals 
\mathrm{(A) \ }6 \qquad \mathrm{(B) \ }7 \qquad \mathrm{(C) \ }\frac{20}{3} \qquad \mathrm{(D) \ }8 \qquad \mathrm{(E) \ }9
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