共50条信息
如图,在\(\triangle ABC\)中,\(D\)是\(AB\)边上任意一点,\(E\)是\(BC\)边中点,过点\(C\)作\(AB\)的平行线,交\(DE\)的延长线于点\(F\),连接\(BF\),\(CD\).
\((1)\)求证:四边形\(CDBF\)是平行四边形;
\((2)\)若\(∠FDB=30^{\circ}\),\(∠ABC=45^{\circ}\),\(BC=4\sqrt{2}\),求\(DF\)的长.
如图,\(Rt\triangle ABC\)中,\(∠ABC=90^{\circ}\),点\(D\),\(F\)分别是\(AC\),\(AB\)的中点,\(CE/\!/DB\),\(BE/\!/DC\).
\((1)\)求证:四边形\(DBEC\)是菱形;
\((2)\)若\(AD=3\), \(DF=1\),求四边形\(DBEC\)面积.
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