题目：如图，在三角形abc中，点d是ab的中点，∠dac=2∠dca，∠dcb=30度，求∠b的度数知乎 Sketch Coloring Page

题目：如图，在三角形abc中，点d是ab的中点，∠dac=2∠dca，∠dcb=30度，求∠b的度数知乎 Template

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sketch #4685 Dave Mustaine by Erika Ishikawa

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sketch #2023 For variety our own good friends fully understand states; through hard knocks we all our own good friends. priceminister

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tomski题目：如图，在三角形abc中，点d是ab的中点，∠dac=2∠dca，∠dcb=30度，求∠b的度数知乎 coloring

题目：如图，在三角形ABC中，点D是AB的中点，∠DAC=2∠DCA，∠DCB=30度，求∠B的度数 知乎 sketch template

题目：如图，在三角形ABC中，点D是AB的中点，∠DAC=2∠DCA，∠DCB=30度，求∠B的度数 知乎 sketch template

如图在三角形ABC中BE=EF=FCED=2DA求阴影部分的面积是三角形ABC面积的几分之几 题目和参考答案——青夏教育精英家教�—— sketch template

如图，在三角形ABC中，D、E、F分别是BC、CA、AB上的点，AD、BE、CF相交于一点O，这样三角形ABC被分成6个三角形，其中4个三角形 sketch template

百度教育 sketch template

百度教育 sketch template

已知在三角形abc中知识要点北京爱智康 sketch template

如图在 ABCD中E是AB的中点ED和AC相交于点F过点F作FG∥AB交AD于点G．1求证AB=3FG2若ABAC sketch template

三角形“四心”有关性质及证明（内心篇） 知乎 sketch template

如图1Rt ABC中∠C=90°按题目所给条件及要求将相应的直角三角形分割成若干个全等的并且分别与原三角形相似的三角形．画出图形并简要 sketch template

如图：在三角形ABC中，若AC CD=AB，∠ ADC=70^° ，∠ ACB=80^° ，求∠ B？百度教育 sketch template

初中数学三角形的中线、高线、角平分线相关知识说明书� sketch template

如图在三角形ABC中已知三角形ADE三角形DCE三角形BCD的面积分别是892628那么三角形DBE的面积是 ． 题目和参考答案 sketch template

百度教育 sketch template

如图，在三角形 ABC 中， D 是 BC 的中点， E 、 F AC 的三等分点。已知三角形 的面积是 108 平方厘米。求三角 sketch template

连结三角形两边中点的线段叫做三角形的中位线如图�，在 ABC 中，D，E分别是AB，AC的中点，DE 就是 的一条中位线 �们可 sketch template

25．如图在 ABC中 DE分别是ACAB上的点 BD与CE交于点O 给出下列三个条件�∠EBO＝∠DCO�∠BEO＝∠CDO sketch template

题目如图在直线l上�放着三个三角形 ABC HFG DCE已知BC=CEFG分别是BCCE的中点FM∥AC∥HG∥DE sketch template

在等边三角形ABC中，点D、E分别在AB、BC边上，连结CD，AE交于点P，且CD=AE，∠ BCD=20°，则∠ APD的度数为百度教育 sketch template

如图在三角形ABC中三角形AEO的面积是1三角形ABO的面积是2三角形BOD的面积是3则四边形DCEO的面积是多�——青夏教育精英 sketch template

如图在三角形ABC中AB=ACD是BC上一点∠BAD=40°E是AC上一点AD=AE求∠EDC的度数． 题目和参考答案——青夏 sketch template

如图在三角形纸片ABC中AB=6BC=8AC=4．沿虚线剪下的涂色部分的三角形与 ABC相似的是ABCD 题目和参考答案——青 sketch template

如图在三角形ABC中AB＞ACDE分别是ABAC上的点 ADE沿线段DE翻折使点A落在边BC上记为A′．若四边形ADA′E是 sketch template

如图，在 ABC中，∠ABC＝90°，AB＝BC，三角形的顶点在相互平行的三条直线l1，l2，l3上，且l1，l2的距离为2，l2，l3的距离 sketch template

如图在 ABC中DE∥BC且AD=3DB=2．写出图中的相似三角形并指出其相似比． 题目和参考答案——青夏教育精英家教�—— sketch template

如图所示已知三角形ABC中∠BAC为钝角． 1画出点C到AB的垂线段 2过A点画BC的垂线 3点B到AC的距离是多� sketch template

如图已知正三角形ABC的边长为1EFG分别是ABBCCA上的点且AE=BF=CG设 EFG的面积为yAE的长为x则y关于x sketch template

百度教育 sketch template

如图等腰三角形ABC中AB=AC顶角∠A=20°在边AB上取一点D使AD=BC求∠BDC的度数 题目和参考答案——青夏教育精英家教�—— sketch template

如图在三角形ABC中D为 BC的中点 AF=2BFCE=3AE连接CF交 DE于 P点求EPDP的值． 题目和参考答案——青夏教育 sketch template

题目如图在等腰直角三角形ABC中∠ABC=90°D为AC边上的中点过D点作DE⊥DF交AB于点E交BC于点F若AE=8FC sketch template

如图在正三角形ABC中DEF分别为各边的中点GHIJ分别为AFADBEDE的中点．将 ABC沿DEEFDF折成三棱锥 sketch template

如图在直角三角形ABC中∠BAC=90°将 ABC沿直线BC�右平移得到 DEF连结ADAE则下列结论中不成立的是 A．AD∥ sketch template

百度教育 sketch template

百度教育 sketch template

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