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1975 AHSME Problems/Problem 26

Revision as of 11:18, 17 February 2021 by Cellsecret (talk | contribs) (Created page with "== Problem 26 == In acute <math>\triangle ABC</math> the bisector of <math>\measuredangle A</math> meets side <math>BC</math> at <math>D</math>. The circle with center <math>...")
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Problem 26

In acute $\triangle ABC$ the bisector of $\measuredangle A$ meets side $BC$ at $D$. The circle with center $B$ and radius $BD$ intersects side $AB$ at $M$; and the circle with center $C$ and radius $CD$ intersects side $AC$ at $N$. Then it is always true that

$\textbf{(A)}\ \measuredangle CND+\measuredangle BMD-\measuredangle DAC =120^{\circ} \qquad \textbf{(B)}\ AMDN\ \text{is a trapezoid}\qquad \textbf{(C)}\ BC\ \text{is parallel to}\ MN\\ \qquad \textbf{(D)}\ AM-AN=\frac{3(DB-DC)}{2}\qquad \textbf{(E)}\ AB-AC=\frac{3(DB-DC)}{2}$

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