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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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正三角形ABC中，AB=6，D、E分别为AC、BC上的动点， 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

题目如图所示边长为2的等边三角形ABC中D点在边BC上运动不与BC重合点E在边AB的延长线上点F在边AC的延长线上AD 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

已知在三角形abc中知识要点北京爱智康 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 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

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纸片ABC中AC＝BC．把 ABC沿着AC翻折点B落在点D处连接BD如果∠BAD＝80°则∠CBD的度数为 °． 题目 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，若AC CD=AB，∠ ADC=70^° ，∠ ACB=80^° ，求∠ B？百度教育 sketch template

百度教育 sketch template

如图在三角形ABC中点DF在边BC上点E在边AB上点G在边AC上∠CDG=∠B∠1 ∠FEA=180°．证明AD∥EF． 题目 sketch template

百度教育 sketch template

如图在三角形ABC中D点为AB的中点E点为BC的中点F点为BE的中点已知三角形DCF面积为63平方厘米则三角形ABC面积为多�平方 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BDDC=12E为AD的中点若三角形ABC的面积为120平方厘米则阴影部分的面积是多�平方厘米 题目和参考 sketch template

百度教育 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

题目如图所示共有21个点每相邻三点所形成的三角形是面积为1平方厘米的等边三角形．求三角形ABC的面积． 题目和参考答案——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

如图在三角形ABC中∠ACB=90°∠B=50°将此三角形绕点C沿顺时针方�旋转后得到三角形A′B′C若点B′恰好落在线段AB上 sketch template

如图三角形ABC在正方形�格中图中每个小正方形的边长均为1个单位长度若点A的坐标为03点B的坐标为按要求解下列问题1在 sketch template

如图在钝角三角形ABC中M为AB边的中点MDEC都垂直于BC边．若三角形BDE的面积是3平方厘米则三角形ABC的面积是多� 题目和 sketch template

如图等边三角形ABC中AB=5延长BC至点P使CP=3将 ABC绕点B顺时针旋转a角得到 DBE连接DPEP则当 DPE为 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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

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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

百度教育 sketch template

题目1如图1在四边形ABCD中FE分别是BCAD的中点连结EF并延长分别与BACD的延长线交于点MN则∠BME=∠ sketch template

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