别把手绢真的丢!【精品-】

丢，丢，丢别把手绢真的丢！曾经，手绢是传递友谊和清洁的使者。如今，手绢的踪迹已难以寻觅，取而代之的是人们快节奏生活下的一次性产物——纸巾、湿巾。据了解，我国现有手绢年生产能力约6亿条，每年出口4.5亿条，留给国人消费的仅1亿多条。目前，我国每百人年均消费手绢已缺乏一条。由于纸巾风行，我国生活用纸消费市场位居全球第二，仅次于美国，一年消耗生活纸制品多达440万吨，这需要砍伐7400多万棵十年生的大树做原料。大量砍伐森林，是对环境的第一轮破坏；造纸企业排污，是对环境的第二轮破坏；乱丢废弃的纸巾，是对环境的第三轮破坏。环保要从小事做起，“广用手帕，少用纸巾，促进人类与自然的和谐〞，让我们从现在开始，从自身做起！正方形复习枫桥镇中学王秀萍轻松过关１、以下说法中，不正确的选项是〔)

〔Ａ〕有一个角是直角的菱形是正方形

〔Ｂ〕有两条边相等的矩形是正方形

〔Ｃ〕对角线互相垂直，且相等的平行四边

形是正方形

〔Ｄ〕每条对角线平分一组对角的矩形是正

方形B〔2〕右图中等腰直角三角形的个数是〔〕A.4个B.5个C.6个D.8个〔1)∠AOB=_______，∠OAB=_______，BD=______，AC=______，２、如右图所示，四边形ABCD是正方形，两条对角线相交于点O，OA=2，那么：ABCDO900450４４Ｄ边长为

，面积为

。２８3、如图，E是正方形ABCD的边BC延长线上的一点，且CE=AC，AE交CD于点F，那么∠E＝∠AFD＝。ABCDEF22.5067.50芝麻开花节节高如图O为正方形ABCD的边CD上一点(O与点C、D不重合)，以OC为一边向正方形ABCD外作正方形OCEF，连结BO、DE，试探索线段BO与DE的：①数量关系；②位置关系。③设正方形ABCD的边长为1，当点O运动到什么位置时BO垂直平分DE？解：①BO=DE在正方形ABCD和正方形OCEF中BC=DC，∠BCO=∠DCE=900，OC=CE∴△BCO≌△DCE〔SAS〕∴BO=DE解：②BO⊥DE延长BO交DE于点G∵△BCO≌△DCE∴∠OBC=∠EDC∴∠EDC+∠CED=900∴∠OBC+∠CED=900∴∠BGE=900即BO⊥DEADBOCFEGADBOCFEADBOCFE如图，假设点O是边长为a的正方形ABCD的中心，正方形OEFG绕点O旋转，设正方形OEFG的边OG、OE分别交AD、CD于点M、N，①线段OM与ON有怎样的数量关系？请说明理由。②此时正方形ABCD的周长被正方形OEFG覆盖局部的长度是否为定值？请说明理由？③被覆盖局部的面积呢？ABCDOGFEMN挑战自我！

请你当设计师ABCDEGHFABCDGEFHADBC如图，把正方形ABCD的四个角〔阴影局部〕向内翻折，得到四边形EFGH，求证：当AE=BF=CG=DH时,四边形EFGH是正方形。GEFH祝各位老师工作顺利！各位同学学有所成！正方形ABCD边长为8，P为对角线BD上一点，求P到CD与BC的距离之和。ABCDPEF：如图在正方形ABCD中，F为CD延长线上一点，CE⊥AF于E，交AD于M，求证：∠MFD＝45°BACMEFD$)26bfkotxCGLQUZ%-27bglpuyDHMQV#&+38chlquzEINRW#*+49dimrvAEJNSX!(059einswBFKOTX$)16afjosxBGLPUY%)26bgkptyCHLQUZ&-37cglpuzDIMRV#&+48dhmqvzEINSW!*049dinrwAFJOSX!(15aejnswBGKPTY$)16bfkotxCGLPUZ%-27bgkpuyDHMQVZ&-38chlquzDINRW#*+48dhmrvAEJNSW!(059einrwBFKOTX$(15afjosxBGKPUY%)26bfkotyCHLQUZ%-37cglpuyDIMRV#&+38chmqvzEINRW!*049dimrvAFJOSX!(05aejnswBFKPTY$)16afjotxCGLPUY%-27bgkptyCHMQVZ&-37chlquzDIMRV#*+48dhmqvAEJNSW!*059einrwAFJOTX$(15aejosxBGKPTY$)26bfkotxCHLQUZ%-27cglpuyDHMQV#&+38chlqvzEINRW#*+49dimrvAEJOSX!(059ejnswBFKOTX$)16afjosxCGLPUY%)26bgkptyCHLQVZ&-37cglquzDIMRV#&+48dhmqvzEJNSW!*049dinrwAFJOSX$(15aejnswBGKPTY$)16bfkotxCGLQUZ%-27bgkpuyDHMQVZ&+38chlquzDINRW#*+48dimrvAEJNSX!(059einrwBFKOTX$(16afjosxBGKPUY%)26bfkptyCHLQUZ&-37cglpuyDIMRV#&+38dhmqvzEINRW!*049dimrwAFJOSX!(15aejnswBFKPTY$)16afkotxCGLPUY%-27bgkptyDHMQVZ&-37chlquzDIMRW#*+48dhmrvAEJNSW!*059einrwAFKOTX$(15aejosxBGKPTY%)26bfkotyCHLQUZ%-27cglpuyDHMNSW!(059einrwAFKOTX$(15afjosxBGKPTY%)26bfkotyCHLQUZ%-37cglpuyDHMRV#&+38chmqvzEINRW#*049dimrvAFJOSX!(05aejnswBFKOTY$)16afjotxCGLPUY%)27bgkptyCHMQVZ&-37chlquzDIMRV#*+48dhmqvAEJNSW!*049einrwAFJOTX$(15aejnsxBGKPTY$)26bfkotxCHLQUZ%-27bglpuyDHMQV#&+38chlquzEINRW#*+49dimrvAEJOSX!(059einswBFKOTX$)16afjosxBGLPUY%)26bgkptyCHLQVZ&-37cglpuzDIMRV#&+48dhmqvzEINSW!*049dinrwAFJOSX!(15aejnswBGKPTY$)16bfkotxCGLPUZ%-27bgkpuyDHMQVZ&-38chlquzDINRW#*+48dimrvAEJNSW!(059einrwBFKOTX$(15afjosxBGKPUY%)26bfkptyCHLQUZ%-37cglpuyDIMRV#&+38chmqvzEINRW!*049dimrwAFJOSX!(05aejnswBFKPTY$)16afjotxCGLPUY%-27bgkptyCHMQVZ&-37chlquzDIMRW#*+48dhmqvAEJNSW!*059einrwAFJOTX$(15aejosxBGKPTY%)26bfkotxCHLQUZ%-27cglpuyDHMQV#&+38chlqvzEINRW#*049dimrvAEJOSX!(059ejnswBFKOTX$)16afjosxCGLPUY%)27bgkptyCHLQVZ&-37cglquzDIMRV#&+48dhmqvzEJNSW!*049dinrwAFJOSX$(15aejnsxBGKPTY$)16bfkotxCGLQUZ%-27bgkpuyDHMQVZ&+38chlquzEINRW#*+48dimrvAEJNSX!(059einrwBFKOTX$(16afjosxBGLPUY%)26bfkptyCHLQUZ&-37cglpuyDIMRV#&+38dhmqvzEINRW!*049dimrwAFJOSX!(15aejnswBFKPTY$)16afkotxCGLPUY%-27bgkptyDHMQVZ&-38chlquzDIMRW#*+48dhmrvAEJNSW!*059einrwAFKOTX$(15afjosxBGKPTY%)26bfkotyCHLQUZ%-27cglpuyDHMRV#&+38chmqvzEINRW#*049dimrvAFJOSX!()26bfkotyCHLQUZ%-37cglpuyDHMRV#&+38chmqvzEINRW!*049dimrvAFJOSX!(05aejnswBFKOTY$)16afjotxCGLPUY%)27bgkptyCHMQVZ&-37chlquzDIMRV#*+48dhmqvAEJNSW!*049einrwAFJOTX$(15aejosxBGKPTY$)26bfkotxCHLQUZ%-27bglpuyDHMQV#&+38chlqvzEINRW#*+49dimrvAEJOSX!(059einswBFKOTX$)16afjosxCGLPUY%)26bgkptyCHLQVZ&-37cglpuzDIMRV#&+48dhmqvzEINSW!*049dinrwAFJOSX$(15aejnswBGKPTY$)16bfkotxCGLPUZ%-27bgkpuyDHMQVZ&+38chlquzDINRW#*+48dimrvAEJNSW!(059einrwBFKOTX$(16afjosxBGKPUY%)26bfkptyCHLQUZ%-37cglpuyDIMRV#&+38dhmqvzEINRW!*049dimrwAFJOSX!(05aejnswBFKPTY$)16afjotxCGLPUY%-27bgkptyDHMQVZ&-37chlquzDIMRW#*+48dhmqvAEJNSW!*059einrwAFKOTX$(15aejosxBGKPTY%)26bfkotxCHLQUZ%-27cglpuyDHMRV#&+38chlqvzEINRW#*049dimrvAEJOSX!(059ejnswBFKOTX$)16afjosxCGLPUY%)27bgkptyCHLQVZ&-37cglquzDIMRV#&+48dhmqvzEJNSW!*049einrwAFJOSX$(15aejnsxBGKPTY$)16bfkoquzDIMRV#*+48dhmqvzEJNSW!*049einrwAFJOTX$(15aejnsxBGKPTY$)26bfkotxCGLQUZ%-27bglpuyDHMQV#&+38chlquzEINRW#*+49dimrvAEJNSX!(059einswBFKOTX$)16afjosxBGLPUY%)26bgkptyCHLQUZ&-37cglpuzDIMRV#&+38dhmqvzEINSW!*049dinrwAFJOSX!(15aejnswBGKPTY$)16afkotxCGLPUZ%-27bgkpuyDHMQVZ&-38chlquzDINRW#*+48dhmrvAEJNSW!(059einrwBFKOTX$(15afjosxBGKPUY%)26bfkotyCHLQUZ%-37cglpuyDIMRV#&+38chmqvzEINRW!*049dimrvAFJOSX!(05aejnswBFKOTY$)16afjotxCGLPUY%-27bgkptyCHMQVZ&-37chlquzDIMRV#*+48dhmqvAEJNSW!*059einrwAFJOTX$(15aejosxBGKPTY$)26bfkotxCHLQUZ%-27cglpuyDHMQV#&+38chlqvzEINRW#*+49dimrvAEJOSX!(059einswBFKOTX$)16afjosxCGLPUY%)26bgkptyCHLQVZ&-37cglpuzDIMRV#&+48dhmqvzEJNSW!*049dinrwAFJOSX$(15aejnswBGKPTY$)16bcglquzDIMRV#&+48dhmqvzEJNSW!*049einrwAFJOSX$(15aejnsxBGKPTY$)16bfkotxCGLQUZ%-27bglpuyDHMQVZ&+38chlquzEINRW#*+48dimrvAEJNSX!(059einswBFKOTX$(16afjosxBGLPUY%)26bfkptyCHLQUZ&-37cglpuyDIMRV#&+38dhmqvzEINSW!*049dimrwAFJOSX!(15aejnswBFKPTY$)16afkotxCGLPUZ%-27bgkptyDHMQVZ&-38chlquzDIMRW#*+48dhmrvAEJNSW!(059einrwAFKOTX$(15afjosxBGKPTY%)26bfkotyCHLQUZ%-37cglpuyDHMRV#&+38chmqvzEINRW#*049dimrvAFJOSX!(059ejnswBFKOTY$)16afjotxCGLPUY%)27bgkptyCHMQVZ&-37cglquzDIMRV#*+48dhmqvAEJNSW!*049einrwAFJOTX$(15aejnsxBGKPTY$)26bfkotxCHLQUZ%-27bglpuyDHMQV#&+38chlquzEINRW#*+49dimrvAEJOSX!(059einswBFKOTX$)16afjosxBGLPUY%)26bgkptyCHLQUZ&-37cglpuzDIMRV#&+48dhmqvzEINSW!*049dinrwAFJOSX!(15aejnswBGKPTY$)16bfkotxCGLPUZ%-27bgkpuyDHMQVZ&-38chlquzDINRSX$(15aejnswBGKPTY$)16bfkotxCGLQUZ%-27bgkpuyDHMQVZ&+38chlquzDINRW#*+48dimrvAEJNSX!(059einrwBFKOTX$(16afjosxBGKPUY%)26bfkptyCHLQUZ&-37cglpuyDIMRV#&+38dhmqvzEINRW!*049dimrwAFJOSX!(05aejnswBFKPTY$)16afkotxCGLPUY%-27bgkptyDHMQVZ&-37chlquzDIMRW#*+48dhmrvAEJNSW!*059einrwAFKOTX$(15aejosxBGKPTY%)26bfkotyCHLQUZ%-27cglpuyDHMRV#&+38chlqvzEINRW#*049dimrvAEJOSX!(059ejnswBFKOTY$)16afjosxCGLPUY%)27bgkptyCHLQVZ&-37cglquzDIMRV#*+48dhmqvzEJNSW!*049einrwAFJOSX$(15aejnsxBGKPTY$)26bfkotxCGLQUZ%-27bglpuyDHMQVZ&+38chlquzEINRW#*+49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