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Suppose that $ABCD$ is a trapezoid in which $\overline{AD}|| \overline{BC}$.  Given $\overline{AC}\perp\overline{CD}$, $\overline{AC}$ bisects angle $\angle BAD$, and $[ABCD]=30$, then compute $[\triangle ACD]$.

 Mar 25, 2021
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[ACD] = 12.

 Apr 11, 2021

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