如图已知d是 Abc的bc边的中点de⊥acdf⊥ab垂足分别为ef且df=de则 Abc是等腰三角形吗请说明理由．——青夏 Sketch Coloring Page

如图已知d是 Abc的bc边的中点de⊥acdf⊥ab垂足分别为ef且df=de则 Abc是等腰三角形吗请说明理由．——青夏 Template

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sketch #1289 peace within

anonymous

anonymous
sketch #1289 peace within

sketch #4888

anonymous

anonymous
sketch #4888

sketch #4405 Cat by Nizamuddin Shuja

anonymous

anonymous
sketch #4405 Cat by Nizamuddin Shuja

sketch #2453 Koi Fish

anonymous

anonymous
sketch #2453 Koi Fish

sketch #119

Johnny B. Goode
sketch #119

sketch #4749 Random Girl by Adellachamp Stand

anonymous

anonymous
sketch #4749 Random Girl by Adellachamp Stand

sketch #3439 Aralé by Malyi Link

anonymous

anonymous
sketch #3439 Aralé by Malyi Link

sketch #5048

anonymous

anonymous
sketch #5048

sketch #245 Fishy

Lucy Barnard
sketch #245 Fishy

sketch #3165

anonymous

anonymous
sketch #3165

sketch #5190 That Night by Nînâ Yämâhä

anonymous

anonymous
sketch #5190 That Night by Nînâ Yämâhä

sketch #2371

anonymous

anonymous
sketch #2371

sketch #215 my mickey mouse

Tom Kelly
sketch #215 my mickey mouse

sketch #4031

anonymous

anonymous
sketch #4031

sketch #3273

anonymous

anonymous
sketch #3273

sketch #3042 Tobi by Mirnes Sinanovic

anonymous

anonymous
sketch #3042 Tobi by Mirnes Sinanovic

sketch #3908 Rawr! by Timothy Palfreyman

anonymous

anonymous
sketch #3908 Rawr! by Timothy Palfreyman

sketch #5009 Elen Jager from Attack on Titan

anonymous

anonymous
sketch #5009 Elen Jager from Attack on Titan

sketch #3444 PSY by Melodee Ripepi

anonymous

anonymous
sketch #3444 PSY by Melodee Ripepi

sketch #779 Gol D Roger

Benjo Arellano
sketch #779 Gol D Roger

sketch #5203 Alien vs. Predator Ani Chachua

anonymous

anonymous
sketch #5203 Alien vs. Predator Ani Chachua

sketch #5297 Journey by Dmitry Sidorenko

anonymous

anonymous
sketch #5297 Journey by Dmitry Sidorenko

sketch #5083

anonymous

anonymous
sketch #5083

sketch #4388 Homer and the Cherry

anonymous

anonymous
sketch #4388 Homer and the Cherry

sketch #5149 Daenerys Targaryen by Jorge Valero

anonymous

anonymous
sketch #5149 Daenerys Targaryen by Jorge Valero

sketch #3404 Terminator by Enrique L. Manly

anonymous

anonymous
sketch #3404 Terminator by Enrique L. Manly

sketch #5166 Jigsaw by Gisele Siqueira Zanni

anonymous

anonymous
sketch #5166 Jigsaw by Gisele Siqueira Zanni

sketch #5058

anonymous

anonymous
sketch #5058

sketch #2919 Winnie the Pooh by Greet Kros-Lolkus

anonymous

anonymous
sketch #2919 Winnie the Pooh by Greet Kros-Lolkus

sketch #2901 Smurf by Ronny Alexander Nikolaevich

anonymous

anonymous
sketch #2901 Smurf by Ronny Alexander Nikolaevich

tomski如图已知d是 abc的bc边的中点de⊥acdf⊥ab垂足分别为ef且df=de则 abc是等腰三角形吗请说明理由．——青夏 coloring

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D是 ABC的边BC上任意一点EF分别是线段ADCE的中点且 ABC的面积为40cm2则 BEF的面积是 Cm2．A．5B sketch template

如图�，已知 ABC是等腰直角三角形，∠BAC＝90°，点D是BC的中点．作正方形DEFG，使点A、C分别在DG和DE上，连接AE、BG．（1 sketch template

怎么证明三角形两边中点的连线平行于底边百度教育 sketch template

16．如图已知D E分别是 ABC的边BC和边AC的中点连接DEAD若S=24cm求 DEC的面积——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

如图已知等边 ABC以边BC为直径的圆与ABAC分别交于点D点E．过点D作DF⊥AC垂足为F．1判断DF与⊙O的位置关系并证明 sketch template

如图已知D是 ABC的BC边的中点DE⊥ACDF⊥AB垂足分别为EF且DF=DE则 ABC是等腰三角形吗请说明理由．——青夏 sketch template

如图AB是半圆⊙O的直径 ABC的两边ACBC分别交半圆于DE且E为BC的中点已知∠BAC=50°则∠C= A 55 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

21．已知如图3 48D是 ABC的边BC上的一点且CD=AB∠BDA=∠BADAE是 ABD的中线．求证 AC=2AE．——青夏 sketch template

如图，Rt ABC中，∠C＝90°，AC＝BC，点D、E分别是边AB、AC上的点，把 ADE沿DE折叠，点A恰好落在BC上的点F处，若点F为 sketch template

如图在 ABC中AB的垂直平分线EF交BC于点E交AB于点FD为线段CE的中点BE=AC1求证AD⊥BC2若∠BAC sketch template

如图已知等边 ABC的边长为6点D为AC的中点点E为BC的中点点P为BD上一点则PE PC的最小值为 A3B32C23D sketch template

如图DE是 ABC中BC边的两个三等分点F是AC的中点AD与EF交于点O则S OAES ABC= ．题目和参考答案——青夏教育精英 sketch template

如图已知等边 ABC以边BC为直径的圆与ABAC分别交于点D点E．过点D作DF⊥AC垂足为F．1判断DF与⊙O的位置关系并证明 sketch template

题目1如图1在四边形ABCD中FE分别是BCAD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

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

如图，已知 ABC中，∠B=∠C，AB=8厘米，BC=6厘米，点D为AB的中点，如果 60887 趣�几何数学天地 33IQ sketch template

如图以 ABC的边AB为直径作⊙O交BC于D过D作⊙O的切线交AC于E要使得DE⊥AC则 ABC的边必须满足的条件是 ．题目和参考 sketch template

如图已知 ABC中AB=BC=AC∠ABC=∠BCA=∠CAB=60°MN分别在 ABC的BCAC边上且BM=CNAMBN交 sketch template

如图已知D是 ABC的BC边的中点DE⊥ACDF⊥AB垂足分别为EF且DF=DE则 ABC是等腰三角形吗请说明理由．——青夏 sketch template

如图点DE分别是 ABC的边ABAC的中点若DE=6则BC=12．题目和参考答案——青夏教育精英家教�—— sketch template

如图DE分别为 ABC的边ABAC上的点BE与CD相交于O点现有四个条件�AB＝AC�OB＝OC�∠ABE＝∠ACD sketch template

如图 ABC为等边三角形以边BC为直径的半圆与边ABAC分别交于DF两点过点D作DE⊥AC垂足为点E．1判断DE与⊙O的位置 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

如图点C在以AB为直径的半圆O上延长BC到点D使得CD=BC过点D作DE⊥AB于点E交AC于点F点G为DF的中点连接CGOF sketch template

如图已知 ABC中∠C=90°点E在边AB上请过点E作一条直线与 ABC的其他边相交于一点D使得以点AED为顶点的三角形与 sketch template

百度教育 sketch template

百度教育 sketch template

如图所示在四棱锥S ABCD中底面ABCD是正方形侧棱SD⊥平面ABCDSD=DC点E是SC的中点作EF⊥SB交SB于点F．1 sketch template

如图，在四边形ABCD中，对角线AC与BD交于点O，已知OA =OC，OB=OD，过点O作EF⊥ BD，分别交AB、DC于点E，F，连接DE sketch template

21如图，已知等腰直角三角形ABC，点P是斜边BC上一点不与B，C重合，PE是 ABP的外接圆⊙O的直径．1求证： APE是等腰直角 sketch template

如图以 ABC的BC边上一点O为圆心的圆经过AB两点且AC是切线⊙O与BC边交于点ED为BE的下半圆弧的中点连接AD交BC于F sketch template

如图1在 ABC中AC=BC∠ACB=90°点D为AB边中点以点D为顶点作∠PDQ=90°DPDQ分别交直线ACBC于EF sketch template

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