別把手絹真的丟!【精品-】

丟，丟，丟別把手絹真的丟！曾經(jīng)，手絹是傳遞友誼和清潔的使者。如今，手絹的蹤跡已難以尋覓，取而代之的是人們快節(jié)奏生活下的一次性產(chǎn)物——紙巾、濕巾。據(jù)了解，我國現(xiàn)有手絹年生產(chǎn)能力約6億條，每年出口4.5億條，留給國人消費的僅1億多條。目前，我國每百人年均消費手絹已缺乏一條。由于紙巾風行，我國生活用紙消費市場位居全球第二，僅次于美國，一年消耗生活紙制品多達440萬噸，這需要砍伐7400多萬棵十年生的大樹做原料。大量砍伐森林，是對環(huán)境的第一輪破壞；造紙企業(yè)排污，是對環(huán)境的第二輪破壞；亂丟廢棄的紙巾，是對環(huán)境的第三輪破壞。環(huán)保要從小事做起，“廣用手帕，少用紙巾，促進人類與自然的和諧〞，讓我們從現(xiàn)在開始，從自身做起！正方形復習楓橋鎮(zhèn)中學王秀萍輕松過關(guān)１、以下說法中，不正確的選項是〔)

〔Ａ〕有一個角是直角的菱形是正方形

〔Ｂ〕有兩條邊相等的矩形是正方形

〔Ｃ〕對角線互相垂直，且相等的平行四邊

形是正方形

〔Ｄ〕每條對角線平分一組對角的矩形是正

方形B〔2〕右圖中等腰直角三角形的個數(shù)是〔〕A.4個B.5個C.6個D.8個〔1)∠AOB=_______，∠OAB=_______，BD=______，AC=______，２、如右圖所示，四邊形ABCD是正方形，兩條對角線相交于點O，OA=2，那么：ABCDO900450４４Ｄ邊長為

，面積為

。２８3、如圖，E是正方形ABCD的邊BC延長線上的一點，且CE=AC，AE交CD于點F，那么∠E＝∠AFD＝。ABCDEF22.5067.50芝麻開花節(jié)節(jié)高如圖O為正方形ABCD的邊CD上一點(O與點C、D不重合)，以O(shè)C為一邊向正方形ABCD外作正方形OCEF，連結(jié)BO、DE，試探索線段BO與DE的：①數(shù)量關(guān)系；②位置關(guān)系。③設(shè)正方形ABCD的邊長為1，當點O運動到什么位置時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延長BO交DE于點G∵△BCO≌△DCE∴∠OBC=∠EDC∴∠EDC+∠CED=900∴∠OBC+∠CED=900∴∠BGE=900即BO⊥DEADBOCFEGADBOCFEADBOCFE如圖，假設(shè)點O是邊長為a的正方形ABCD的中心，正方形OEFG繞點O旋轉(zhuǎn)，設(shè)正方形OEFG的邊OG、OE分別交AD、CD于點M、N，①線段OM與ON有怎樣的數(shù)量關(guān)系？請說明理由。②此時正方形ABCD的周長被正方形OEFG覆蓋局部的長度是否為定值？請說明理由？③被覆蓋局部的面積呢？ABCDOGFEMN挑戰(zhàn)自我！

請你當設(shè)計師ABCDEGHFABCDGEFHADBC如圖，把正方形ABCD的四個角〔陰影局部〕向內(nèi)翻折，得到四邊形EFGH，求證：當AE=BF=CG=DH時,四邊形EFGH是正方形。GEFH祝各位老師工作順利！各位同學學有所成！正方形ABCD邊長為8，P為對角線BD上一點，求P到CD與BC的距離之和。ABCDPEF：如圖在正方形ABCD中，F(xiàn)為CD延長線上一點，CE⊥AF于E，交AD于M，求證：∠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&+38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