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[几何] 平面几何请教一下第三问

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hjfmhh Posted 2023-6-3 17:38 |Read mode

平面几何请教一下第三问

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乌贼 Posted 2023-6-3 18:28

Last edited by 乌贼 2023-6-4 10:55

取$ AE $中点$ F $，有\[ \angle DFE=\angle B \]\[ FD\perp CD \]所以\[ \tan \angle B=2\sqrt{\dfrac{4}{k^2}+\dfrac{2}{k}} \]

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