下图每个小方格的边长是1厘米，请以A为圆心，AB为半径画一个圆，求这个圆的周长 根据要求操作．（1）在右面的方格图中（每个方格的边长表示1厘...

\u64cd\u4f5c\u9898\uff1a\uff081\uff09\u56fe\u4e2d\uff0c\u5706\u5fc3O\u7684\u4f4d\u7f6e\u7528\u6570\u5bf9\u8868\u793a\u662f\uff08\uff0c\uff09\uff0e\u5982\u679c\u6bcf\u4e2a\u5c0f\u65b9\u683c\u7684\u8fb9\u957f\u662f1\u5398\u7c73\uff0c\u8fd9\u4e2a\u5706\u7684\u5468\u957f\u662f_____

\uff081\uff09\u627e\u51fa\u56fe\u4e2d\u5706\u5fc3O\u5bf9\u5e94\u7684\u5217\u6570\u4e0e\u884c\u6570\uff0c\u5217\u6570\u5199\u5728\u6570\u5bf9\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6570\uff0c\u884c\u6570\u5199\u5728\u6570\u5bf9\u4e2d\u7684\u7b2c\u4e8c\u4e2a\u6570\uff0c\u5373\u5706\u5fc3O\u7684\u4f4d\u7f6e\u7528\u6570\u5bf9\u8868\u793a\u662f\uff0816\uff0c4\uff09\uff0e\u7531\u56fe\u77e5\u5706\u7684\u534a\u5f84\u662f2\u5398\u7c73\uff0c\u6545\u5706\u7684\u5468\u957f\u662f\uff1a2\u00d73.14\u00d72=12.56\uff08\u5398\u7c73\uff09\uff0c\u5706\u7684\u9762\u79ef\u662f\uff1a3.14\u00d722=12.56\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff1b\u6545\u7b54\u6848\u4e3a\uff1a16\uff0c4\uff0c12.56\uff0c12.56\uff1b\uff082\uff09\u5706\u63092\uff1a1\u7684\u6bd4\u653e\u5927\uff0c\u5373\u534a\u5f84\u6269\u5927\u4e862\u500d\uff0c\u53d8\u62104\u5398\u7c73\uff0c\u518d\u4ee5O\u4e3a\u5706\u5fc3\uff0c\u4ee54\u5398\u7c73\u534a\u5f84\u753b\u5706\u5373\u53ef\u5f97\u5230\u653e\u5927\u540e\u7684\u56fe\u5f62\uff1b\u5982\u56fe\u6240\u793a\uff1a\uff083\uff09\u6839\u636e\u6570\u5bf9\u8868\u793a\u4f4d\u7f6e\u7684\u65b9\u6cd5\uff1a\u7b2c\u4e00\u4e2a\u6570\u5b57\u8868\u793a\u5217\uff0c\u7b2c\u4e8c\u4e2a\u6570\u5b57\u8868\u793a\u884c\uff0c\u5373\u53ef\u5728\u5e73\u9762\u56fe\u4e2d\u627e\u5230\u5b83\u4eec\u7684\u4f4d\u7f6e\uff0c\u5728\u987a\u6b21\u8fde\u63a5\u8d77\u6765\u5f97\u5230\u7684\u56fe\u5f62\u662f\u76f4\u89d2\u68af\u5f62\uff0c\u518d\u6839\u636e\u56fe\u5f62\u5e73\u79fb\u7684\u65b9\u6cd5\uff0c\u5148\u628a\u6b64\u56fe\u5f62\u7684\u56db\u4e2a\u9876\u70b9\u5206\u522b\u5411\u53f3\u5e73\u79fb5\u683c\uff0c\u518d\u628a\u5b83\u7684\u56db\u4e2a\u70b9\u5206\u522b\u5411\u4e0a\u5e73\u79fb2\u683c\uff0c\u518d\u628a\u5404\u70b9\u4f9d\u6b21\u8fde\u63a5\u8d77\u6765\uff0c\u5373\u53ef\u5f97\u51fa\u5e73\u79fb\u540e\u7684\u56fe\u5f62A\u2032B\u2032C\u2032D\u2032\uff1b\u5982\u56fe\u6240\u793a\uff1a\u6545\u7b54\u6848\u4e3a\uff1a\u76f4\u89d2\u68af\u5f62\uff0e

\uff081\uff09\u4ee5\u70b9O\uff085\uff0c3\uff09\u4e3a\u5706\u5fc3\uff0c\u4ee53\u5398\u7c73\u4e3a\u534a\u5f84\u5373\u53ef\u5728\u65b9\u683c\u56fe\u4e2d\u753b\u51fa\u8fd9\u4e2a\u5706\uff0c\u5982\u56fe\u6240\u793a\uff1a \uff082\uff09\u89c2\u5bdf\u4e0a\u56fe\u53ef\u77e5\uff0c\u76f4\u5f84\u7684\u4e00\u4e2a\u7aef\u70b9\u662f\uff088\uff0c3\uff09\uff0c\u4e00\u4e2a\u7aef\u70b9\u662f\uff082\uff0c3\uff09\uff0c\u7531\u6b64\u5373\u53ef\u753b\u51fa\u8fd9\u6761\u76f4\u5f84\u5982\u4e0b\u56fe\u6240\u793a\uff1b \uff083\uff09\u5706\u7684\u9762\u79ef\u662f\uff1a3.14\u00d73 2 =3.14\u00d79=28.26\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u7b54\uff1a\u8fd9\u4e2a\u5706\u7684\u5468\u957f\u662f18.84\u5398\u7c73\uff0c\u9762\u79ef\u662f28.26\u5e73\u65b9\u5398\u7c73\uff0e

观察到这个圆的半径 为3㎝，
圆周长C=3.14×2×3
=18.84㎝。

涓嬪浘姣忎釜灏忔柟鏍肩殑杈归暱鏄1鍘樼背,璇蜂互A涓哄渾蹇,AB涓哄崐寰勭敾涓涓渾,姹傝繖涓...
绛旓細=18.84銕濄

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绛旓細涓や釜鍥炬垜閮芥湁鐢ㄧ孩绗旀爣杩囷紝鏈夌偣涓戜笉瑕佸湪鎰忥紝杩樻湁涓嶆噦鐨勫啀闂垜

涓嬪浘姣忎釜灏忔柟鏍肩殑杈归暱琛ㄧず1cm銆傜敾涓涓暱鏂瑰舰,鍛ㄩ暱鏄20cm,闀垮鐨勬瘮鏄7...
绛旓細1銆佺敱棰樻剰璁鹃暱鏂瑰舰鐨勯暱鍜屽鏄痻銆亂 宸茬煡闀挎柟褰㈢殑鍛ㄩ暱鏄20cm锛岄暱瀹界殑姣旀槸7姣3.鍒欐湁2x+2y=20 鈶 x锛歽=7锛3 鈶 鐢扁憼寰楀嚭锛歺+y=10鍗硑=10-x锛屽皢鍏朵唬鍏モ憽涓緱鍒帮細x=7锛3脳锛10-x锛 鈶 寰楀嚭锛歺=7 灏嗗叾浠ｅ叆鈶′腑寰楀嚭锛歽=3 鎵浠ラ暱鏂瑰舰鐨勯暱鍜屽鍒嗗埆鏄7cm鍜3cm銆2銆5灏忔椂=5脳60...

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绛旓細锛1锛夌敱棰樻剰鍙煡锛氬渾蹇冧负锛2锛4锛夛紝鍒欒繖涓崐鍦嗙殑鍗婂緞涓4鍘樼背锛鎵鐢诲崐鍦嗗涓嬪浘鎵绀猴紱锛2锛夊崐鍦嗙殑鍛ㄩ暱锛2脳3.14脳4梅2+4脳2锛=3.14脳4+8锛=12.56+8锛=20.56锛堝帢绫筹級锛涘崐鍦嗙殑闈㈢Н锛3.14脳4 2 梅2锛=3.14脳16梅2锛=50.24梅2锛=25.12锛堝钩鏂瑰帢绫筹級锛涚瓟锛氳繖涓崐鍦嗙殑鍛ㄩ暱鏄20.56...

宸茬煡鍥句腑姣忎釜灏忔柟鏍肩殑杈归暱鏄1鍘樼背,姹傚嚭閫楀彿鐨勫懆闀
绛旓細灏嗗乏涓嬭鏂规牸涓殑鍦嗗姬绉昏嚦鍙抽潰涓棿鏂规牸涓傛濂芥槸涓涓崐寰涓1鍘樼背鍦嗙殑鍛ㄩ暱銆傛渶闀跨殑閭ｆ鍦嗗姬绛変簬鍗婂緞涓2鍘樼背鍦嗗懆闀跨殑鍥涘垎涔嬩竴銆傛牴鎹渾鍛ㄩ暱锛2蟺r銆傚彲璁＄畻鍑洪楀彿鐨勫懆闀匡細3.14脳1脳2锛3.14脳2脳2梅4 锛6.28锛3.14 锛9.42锛堝帢绫筹級闈㈢Н涓庡懆闀 濡傛灉浠ュ悓涓闈㈢Н鐨勪笁瑙掑舰鑰岃█锛屼互绛夎竟涓夎褰㈢殑鍛ㄧ晫鏈...

姣忎釜灏忔柟鏍肩殑杈归暱鏄1cm,杩欎釜骞宠鍥涜竟褰㈢殑闈㈢Н鏄灏?娑傝壊鐨勪笁瑙掑舰鐨勯潰绉...
绛旓細鍥犱负骞宠鍥涜竟褰㈢殑闈㈢Н鍏紡锛氬簳脳楂樸傜敱鍥剧煡閬撳钩琛屽洓杈瑰舰搴曚负6cm锛岄珮涓4cm銆傛墍浠ュ畠鐨勯潰绉槸6脳4=24cm銆

鍥翠竴鍥.濡傚浘姣忎釜灏忔柟鏍肩殑杈归暱鏄1鍘樼背,璇峰湪鏂规牸鍥句笂鐢讳竴涓钩闈㈠浘褰,浣垮畠...
绛旓細锛1锛夊钩琛屽洓杈瑰舰锛氬洜涓12=3脳4=6脳2锛屾墍浠ョ敾鍑虹殑骞宠鍥涜竟褰㈢殑闀夸笌楂樺垎鍒槸4鍘樼背鍜3鍘樼背锛鎴6鍘樼背鍜2鍘樼背濡傚浘鎵绀猴細锛2锛夐暱鏂瑰舰锛氬洜涓12=2脳6=3脳4锛屾墍浠ョ敾鍑虹殑闀挎柟褰㈢殑闀夸笌瀹藉垎鍒槸6鍘樼背鍜2鍘樼背鎴3鍜4鍘樼背锛屽鍥炬墍绀猴細

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