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如图,在△ABC中,AB=AC,∠BAC=120°,AD是BC边上的中线,且BD=BE,CD的垂直平分线MF交AC于F,交BC于M.(1)求∠ADE的度数.(2)求证:△ADF是正三角形.
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教案备课库《初一年级数学拓展学案201721028》真题及答案
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如图1△ABC中∠BAC=120°AD⊥BC于D.且AB+BD=DC则∠C.的大小是[]
20°
25°.
30°
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如图△ABC内接于⊙O∠BAC=120°AB=ACBD为⊙O的直径AD=6则DC=.
如图△ABC内接于⊙O.∠BAC=120°AB=ACBD为⊙O.的直径AD=6则BC等于.
如图在△ABC中D.E在BC上且BD=DE=AD=AE=EC则∠BAC的度数是
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已知如图△ABC内接于⊙O.∠BAC=120°AB=ACBD为⊙O.的直径AD=6求BC的长.
如图在△ABC中D.E.在BC上且BD=DE=AD=AE=EC则∠BAC的度数是_____.
30°
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如图△ABC内接于⊙O.∠BAC=120°AB=ACBD为⊙O.的直径AD=6则BC等于.
如图△ABC中AB=AC∠BAC=120°AD⊥AC交BC于点D求证BC=3AD.
如图△ABC内接于⊙O∠BAC=120°AB=ACBD为⊙O的直径AD=6则DC=.
如图二△ABC中AB=AC∠BAC=120ºAD⊥ACDC=8则BD=.
如图△ABC中∠BAC=120°AD为中线将AD绕点A.顺时针旋转120°得到AE连接BEF.为AC
如图△ABC≌△ADE则AB=∠E.=∠.若∠BAE=120°∠BAD=40°则∠BAC=.
如图△ABC中AB=AC∠BAC=120°AD⊥AC交BC于点D.求证BC=3AD.
如图18△ABC中∠ABC=45°AD是∠BAC的平分线EF垂直平分AD交BC的延长线于F.则∠CA
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