共50条信息
如图,\(D\)为\(\angle BAC\)的外角平分线上一点并且满足\(BD=CD\),\(\angle DBC=\angle DCB\),过\(D\)作\(DE\bot AC\)于\(E\),\(DF\bot AB\)交\(BA\)的延长线于\(F\),则下列结论:
\(①\triangle CDE\)≌\(\triangle BDF\);\(②CE=AB+AE\);\(③\angle BDC=\angle BAC\);\(④\angle DAF=\angle CBD\).
其中正确的结论有\((\) \()\).
\((1)\)如图,矩形\(ABCD\)中,\(E\)是\(AD\)的中点,将\(\triangle ABE\)沿\(BE\)折叠后得到\(\triangle GBE\),且点\(G\)在矩形\(ABCD\)内部\(.\)小明将\(BG\)延长交于点\(F\),认为\(GF=DF\),你同意吗?说明理由.
\((2)(\)设\(DF=x\),\(AD=y)\)保持\((1)\)中的条件不变,若\(DC=2DF\),求\(\dfrac{AD}{AB}\)的值;
\((3)\)保持\((1)\)中的条件不变,若\(DC=nDF\),求\(\dfrac{AD}{AB}\)的值;
已知如图,在长方形\(ABCD\)中,点\(E\)是\(AD\)的中点,连结\(BE\),将\(\triangle ABE\)沿着\(BE\)翻折得到\(\triangle FBE\),\(EF\)交\(BC\)于点\(H\),延长\(BF\)、\(DC\)相交于点\(G\),若\(DG=16\),\(BC=24\),则\(FH=\)_________.
如下图\(.\)在矩形\(ABCD\)中,\(AB=8\),\(BC=4\),将矩形沿\(AC\)折叠,点\(D\)落在点\(E\)处,且\(CE\)与\(AB\)交于\(F\),那么\(S_{\triangle ACF}\)为( )
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