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 #3290 Calvin and Hobbes by অনন্ত জলিল

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sketch #3290 Calvin and Hobbes by অনন্ত জলিল

sketch #5054 Angelina Jolie by Hailey So Pretty

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sketch #5054 Angelina Jolie by Hailey So Pretty

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sketch #2278 flower

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sketch #2278 flower

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sketch #3604 Falling Manipati Surya

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sketch #3604 Falling Manipati Surya

sketch #4710

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sketch #4710

sketch #3489 Panda by Scott Terry

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sketch #3489 Panda by Scott Terry

sketch #3268 Werewolf by Mert Arda Yiğit

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sketch #3268 Werewolf by Mert Arda Yiğit

sketch #3413 Link by Dã Tr� ng

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sketch #3413 Link by Dã Tr� ng

sketch #5284

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sketch #2178

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sketch #2178

sketch #1892 hmmmm........

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sketch #1892 hmmmm........

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sketch #280

sketch #5094 Squirrel by Mehdi Público

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sketch #5094 Squirrel by Mehdi Público

sketch #1697

Abdul Kaium Alamgir
sketch #1697

sketch #1145

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sketch #1145

sketch #3535 Mickey by Hakan Usuğ

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sketch #3535 Mickey by Hakan Usuğ

sketch #3330

Matt King
sketch #3330

sketch #944

Laura Agapi Asnicar
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sketch #5116 Bleach by Vrushali Rane

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sketch #5116 Bleach by Vrushali Rane

sketch #302

Chrystal Smith
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sketch #5135 &#;Hypno Colorfull&#; by Lars Tunebo

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sketch #5135 &#;Hypno Colorfull&#; by Lars Tunebo

sketch #4566 Edward Scissorhands by Angel Ördoñez

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sketch #4566 Edward Scissorhands by Angel Ördoñez

sketch #5281

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sketch #4916

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sketch #4916

sketch #2678 Portrait by Jocelyn Alejandra Rantul

Jocelyn Alejandra Rantul
sketch #2678 Portrait by Jocelyn Alejandra Rantul

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Donara Smbatyan
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sketch #5339

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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

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

Java编程证明：三角形A2B2C2面积是三角形ABC面积的七分之一已知一个正三角形abc其内分点a1、b1、c1使得2ac1 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

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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 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

如图，在直角三角形ABC中，∠ACB=90°，∠CBA=30°，请你设计三种不同的分法，把 ABC分割成两个三角形，且 ZOL问答 sketch template

如图所示在三角形ABC中D为BC的中点AD和BE相交F点已知三角形ABC的面积为42平方厘米求三角形BDF的面积． 题目和参考答案 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

百度教育 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

如图中三角形ABC的面积是平行四边形DBCE面积的 A．一半 B．2倍 C．相等 题目和参考答案——青夏教育精英家教�—— sketch template

百度教育 sketch template

在三角形ABC中点O是AC边上一个动点过点O作MN∥BC设MN交∠BCA的平分线于点E交 ABC的外角∠ACD平分线于点E．1求证 sketch template

如图所示三角形DEF平移得到三角形ABC已知∠B=45°∠C=65°AB=2cm则∠DFE=65度DE=2cm． 题目和参考答案 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

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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

如图三角形ABC中E为AC之中点．BD=2DCAD与BE交于F则三角形BDF的面积四边形DCEF的面积=8787． 题目和参考答案 sketch template

百度教育 sketch template

如图点DEF分别在等边三角形ABC的边ABBCCA的延长线上且BD=CE=AF说明 DEF为等边三角形． 题目和参考答案——青夏 sketch template

百度教育 sketch template

如图 ABC与 ADE都是等腰三角形AD=AEAB=AC∠DAB=∠CAE求证 ABC∽ ADE． 题目和参考答案——青夏教育精英 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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

百度教育 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

如图等边三角形ABC中DE分别为ABBC边上的两个动点且总使BD=CEAE与CD交于点FAG⊥CD于点G则以下结论∠AFG sketch template

百度教育 sketch template

百度教育 sketch template

如图 ABC中点DE分别在BC和AC边上点G是BE边上一点且∠BAD=∠BGD=∠C联结AG．1求证BD•BC=BG•BE sketch template

百度教育 sketch template

百度教育 sketch template

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