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← Problem 227: (2021 Fall AMC 12b, 24) →
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Problem 227: (2021 Fall AMC 12b, 24)
Triangle $ABC$ has side lengths $AB = 11, BC=24$, and $CA = 20$. The bisector of $\angle{BAC}$ intersects $\overline{BC}$ in point $D$, and intersects the circumcircle of $\triangle{ABC}$ in point $E \ne A$. The circumcircle of $\triangle{BED}$ intersects the line $AB$ in points $B$ and $F \ne B$. What is $CF$? $\textbf{(A) } 28 \qquad$ $ \textbf{(B) } 20\sqrt{2} \qquad$ $ \textbf{(C) } 30 \qquad$ $ \textbf{(D) } 32 \qquad$ $ \textbf{(E) } 20\sqrt{3}$
Solution
Exercise 227: Solution
Triangle $ABC$ has side lengths $AB=20, BC=21, CA=9$. The bisector of $\angle BAC$ meets $\overline{BC}$ at $D$ and the circumcircle at $E\ne A$. The circumcircle of $\triangle BED$ meets line $AB$ at $B$ and $F\ne B$. What is $CF$?
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