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 #5052 Gorillaz by Rafał Dawid

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sketch #5207 Gorilla by Jean-Benoit Renaud

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sketch #5207 Gorilla by Jean-Benoit Renaud

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sketch #5047 Pikachu and Raichu by Saiful Farizam

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sketch #2895 Hulk by Dmitry Cherepanin

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sketch #2220 bahbah sexy sheep

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sketch #2877 Elvis by Karoline Castillo

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sketch #2877 Elvis by Karoline Castillo

sketch #3036 Wiz Khalifa by Malyi Link

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sketch #3036 Wiz Khalifa by Malyi Link

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sketch #933 mts

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sketch #933 mts

sketch #1034 what ever you want it to be

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sketch #1034 what ever you want it to be

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sketch #2856 Merry Christmas from Melany Campano Laos Komlós László

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sketch #2856 Merry Christmas from Melany Campano Laos Komlós László

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sketch #2770 Maggie by Shuvo Islam

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sketch #4306 The burning watermelon!

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sketch #4306 The burning watermelon!

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sketch #3444 PSY by Melodee Ripepi

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sketch #3523 My World My Way by Elena Artene

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sketch #3659 Portrait by Mari Falcsik

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sketch #4685 Dave Mustaine by Erika Ishikawa

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sketch #3897 dolphins playing over the sea

sketch #3732 Michael Jackson by David Obando

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sketch #3732 Michael Jackson by David Obando

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，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

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，若AC CD=AB，∠ ADC=70^° ，∠ ACB=80^° ，求∠ B？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

三角形“四心”有关性质及证明（内心篇） 知乎 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

百度教育 sketch template

题目1操作如图在已知内角度数的三个三角形中请用直尺从某一顶点画一条线段把原三角形分割成两个等腰三角形并在图中标注相应的角的 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已知等边三角形ABC在BC的延长线上取一点E以CE为边作等边三角形DCE连接AEBD．点M是BD的中点点N是AE的中点．1在图 sketch template

百度教育 sketch template

如图所示，边长为2的等边三角形中，D点在边上运动（不与B、C重合），点E在边的延长线上，点F在边的延长线上，． 点D在边上从B至C的运动过程 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

题目如图三角形ABC中AB=3AC=4以BC为边�三角形外作等边三角形BCD连AD则当∠BAC= 度时AD有最大值． 题目和 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

初二下（八下）数学期末压轴题训练—勾股定理（合集1） 知乎 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

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 ABC中∠C=90°AC=BC点D为AB的中点点EF分别为ACBC边上的动点且CE=BF当点EF分别在边ACBC 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

题目如图在平行四边形ABCD中∠ABC的平分线交AC于点E交AD于点F交CD的延长线于点G若AF＝2FD则的值为 AB 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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 ABC是等腰直角三角形以直角边AB为直径作半圆与斜边AC交于D且AB=20厘米求阴影部分的面积． 题目和参考答案——青夏教育 sketch template

题目如图已知 ABC是边长为3的等边三角形点D是边BC上的一点且BD＝1以AD为边作等边 ADE过点E作EF∥BC交AC于点F sketch template

百度教育 sketch template

百度教育 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 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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

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

如图在平面直角坐标系中把 ABC沿y轴对折后得到 A1B1C1再将 A1B1C1�下平移4个单位长度得到 A2B2C2则 AB1C2的 sketch template

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