7．如图5点def分别是abbcca边的中点则图中的平行四边形一共有 3个 d4个——青夏教育精英家教�—— Sketch Coloring Page

7．如图5点def分别是abbcca边的中点则图中的平行四边形一共有 3个 d4个——青夏教育精英家教�—— Template

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tomski7．如图5点def分别是abbcca边的中点则图中的平行四边形一共有 3个 d4个——青夏教育精英家教�—— coloring

7．如图5点DEF分别是ABBCCA边的中点则图中的平行四边形一共有 3个 D4个——青夏教育精英家教�—— sketch template

7．如图5点DEF分别是ABBCCA边的中点则图中的平行四边形一共有 3个 D4个——青夏教育精英家教�—— sketch template

平面几何定理及证明（1）知乎 sketch template

如图已知长方体ABCD A1B1C1D1中AB=BC=2AA1=1点EF分别是A1B1B1C1的中点点O是AB与BD的交点．1 sketch template

【问题情境�（1）如图1，正方形ABCD中，E、F分别是边AB和对角线AC上的点，∠EDF=45°．易证 DBE∽ DCF（不需写出证明过程 sketch template

20．如图点DEF分别在ABBCAC上且DE∥ACEF∥AB下面写出了说明“∠A ∠B ∠C＝180° 的过程请填空因为 sketch template

$如图在 ABC中DE分别是ABBC上的点且DE∥AC若$frac{{S} { BDE}}{{S} DEC}}$=$frac sketch template$

【方法引领�如图1，点E、F分别是正方形ABCD的BC、CD边上的动点，连接AE、AF和EF，∠EAF=45°．若BE=2，DF=3，求EF的 sketch template

空间仿射坐标系知乎 sketch template

在 ABC中点DEF分别在ABBCAC上且∠ADF=∠BED∠AFE=∠BDE．1如图1DG⊥BC于G当∠A=90 sketch template

如图点DEF分别是 ABC的边BCACAB上的点则∠1 ∠2 ∠3 ∠4 ∠5 ∠6等于 A．180°B．240°C．360 sketch template

如图等边三角形ABC中点DEF分别为边ABACBC的中点M为直线BC动点 DMN为等边三角形1如图1当点M在点B左侧时 sketch template

题目如图正方形ABCD的边长为5E是AB上一点且BEAE=14若P是对角线AC上一动点则PB PE的最小值是 ．题目和参考 sketch template

�假突破：平行四边形问题的五大类型方法小结每日头条 sketch template

如图在 ABC中点DEF分别在BCABAC上且DE∥ACDF∥AB．1如果∠BAC=90°那么四边形AEDF是 形2 sketch template

如图已知点P是正方形ABCD所在平面外一点PA⊥平面ABCDPA=AB=2点EFH分别是线段PBACPA的中点．1求证 sketch template

14．如图点DEF分别是 ABC三边上的中点．若 ABC 的面积为12则 DEF的面积为．——青夏教育精英家教�—— sketch template

如图正方形ABCD中点EF分别在BCCD上∠EAF=45°AEAF分别于BD相交于点MN1求证BM2 DN2=MN2 sketch template

如图点EF分别是菱形ABCD的边BCCD上的点且 ∠EAF=∠D=60°∠FAD=45°则∠CFE= A60B45C sketch template

如图点DEF分别在等边三角形ABC的边ABBCCA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

如图点EF分别是菱形ABCD的边BCCD上的点且 ∠EAF=∠D=60°∠FAD=45°则∠CFE= A60B45C sketch template

如图点DEFB在同一直线上AB∥CDAE∥CF且AE=CF若BD=10BF=2则EF= ——青夏教育精英家教�—— sketch template

如图AD是 ABC的中线AB=AEAC=AF∠BAE=∠FAC=90°．判断线段AD与EF数量和位置关系．题目和参考答案——青夏教育 sketch template

已知如图在 ABC中AB的垂直平分线分别交ABBC于点MEAC的垂直平分线分别交ACBC于点NF∠B=27°∠BAC=2∠ sketch template

如图四面体ABCD的每条棱长都等于2点EF分别为棱ABAD的中点则AB BC= BC EF= EF与AC所成的角为 sketch template

14．如图点DEF分别是 ABC三边上的中点．若 ABC 的面积为12则 DEF的面积为．——青夏教育精英家教�—— sketch template

题目实验探究1动手操作�如图1将一块直角三角板DEF放置在直角三角板ABC上使三角板DEF的两条直角边DEDF分别经过点B sketch template

如图等边 ABC中DE分别为ABBC边的延长线上的点且BD=CEDC的延长线交AE于点FAG⊥CD于点G．1求证 ACE≌ sketch template

百度教育 sketch template

百度教育 sketch template

如图已知C是AB的中点D是AC的中点E是BC的中点 1若AB=18cm求DE的长2若CE=5cm求DB的长——青夏 sketch template

百度教育 sketch template

如图点DE分别在线段ABAC上BECD相交于点OAE＝AD要使 ABE≌ ACD需添加一个条件是 ——青夏教育精英家教�—— sketch template

如图所示，已知边长为4的正三角形ABC中，E，F分别为BC和AC的中点，PA=2，且PA⊥平面ABC，设Q是CE的中点（1）求证：AE∥平面 sketch template

如图所示已知点AEFD在同一条直线上AE=DFBF⊥ADCE⊥AD垂足分别为FEBF=CE求证AB∥CD．题目和参考 sketch template

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