共50条信息
如图,在\(\triangle ABC\)中,\(AB=AC\),以\(AB\)为直径的\(\odot O\)与边\(BC\),\(AC\)分别交于点\(D\),\(E.DF\)是\(\odot O\)的切线,交\(AC\)于点\(F\).
\((1)\)求证:\(DF⊥AC\);
\((2)\)若\(AE=4\),\(DF=3\),求\(\tan A\).
如图,\(\Delta ABC\)中,\(D\)、\(E\)分别是\(AB\)、\(AC\)上点,\(DE/\!/BC\),\(AD=2\),\(DB=1\),\(AE=3\),则\(EC\)长
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