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 #5149 Daenerys Targaryen by Jorge Valero

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sketch #2486 Face by sketchmaster

sketchmaster
sketch #2486 Face by sketchmaster

sketch #4358 Wink Károly Benkő

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sketch #4358 Wink Károly Benkő

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sketch #3499 Alien Laura Gutierrez Hinojosa

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sketch #3499 Alien Laura Gutierrez Hinojosa

sketch #5127 Captain America by Mark Phillips

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sketch #5127 Captain America by Mark Phillips

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sketch #5050

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sketch #3012 Girl by Safa M. Esam Srk

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sketch #3012 Girl by Safa M. Esam Srk

sketch #5079 SketchToy Pencil by Sarah Prieto

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anonymous
sketch #5079 SketchToy Pencil by Sarah Prieto

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sketch #3558 Eye Rubel Parvez

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sketch #3558 Eye Rubel Parvez

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sketch #3350 Gerard Way by Carrieann Benthem

anonymous

anonymous
sketch #3350 Gerard Way by Carrieann Benthem

sketch #5324 Angelina Jolie - Maleficent by Lucas Fajardo

anonymous

anonymous
sketch #5324 Angelina Jolie - Maleficent by Lucas Fajardo

sketch #2627 Taz by sketchmaster

sketchmaster
sketch #2627 Taz by sketchmaster

sketch #2646 Buzzy bee on flowers

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sketch #2646 Buzzy bee on flowers

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anonymous

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sketch #2573 homer simpson

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sketch #871 vampire girl anime

sketch #5052 Gorillaz by Rafał Dawid

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sketch #5052 Gorillaz by Rafał Dawid

sketch #4264 oh yeah

anonymous

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sketch #4264 oh yeah

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anonymous

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sketch #5156 Angry Bird by Roberto Castro Colimil

sketch #523 the man

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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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

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 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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

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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

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

百度教育 sketch template

如图 ABC是等边三角形分别延长CAABBC到A′B′C′使AA′=BB′=CC′=AC若 ABC的面积为1则 A′B′C 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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

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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

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

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 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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

百度教育 sketch template

百度教育 sketch template

如图在 ABC中DE分别是边ABAC的中点BC=8则DE=． 题目和参考答案——青夏教育精英家教�—— 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

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

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

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

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