已知圆的周长求直径的公式 圆的周长求直径的公式？
\u77e5\u9053\u5706\u7684\u5468\u957f\uff0c\u600e\u4e48\u6c42\u76f4\u5f84\u662f\u591a\u5c11\uff0c\u516c\u5f0f\u5706\u7684\u5468\u957f\u516c\u5f0f\u4e3aC\uff08\u5468\u957f\uff09=2\u03c0r\uff08\u534a\u5f84\uff09\u6216\u8005C=\u03c0d\uff08\u76f4\u5f84\uff09\u3002\u56e0\u6b64\uff0c\u5706\u7684\u76f4\u5f84d=C\uff08\u5468\u957f\uff09/\u03c0\u3002\u5176\u4e2d\u03c0\u662f\u5706\u5468\u7387\uff0c\u662f\u6709\u56fa\u5b9a\u6570\u503c\u7684\uff0c\u4e00\u822c\u53d6\u503c\u03c0=3.14\u3002
\u6269\u5c55\u8d44\u6599\uff1a\u5706\uff1a\u5706\u662f\u4e00\u79cd\u51e0\u4f55\u56fe\u5f62\u3002\u6839\u636e\u5b9a\u4e49\uff0c\u901a\u5e38\u7528\u5706\u89c4\u6765\u753b\u5706\u3002 \u540c\u5706\u5185\u5706\u7684\u76f4\u5f84\u3001\u534a\u5f84\u957f\u5ea6\u6c38\u8fdc\u76f8\u540c\uff0c\u5706\u6709\u65e0\u6570\u6761\u534a\u5f84\u548c\u65e0\u6570\u6761\u76f4\u5f84\u3002\u5706\u662f\u8f74\u5bf9\u79f0\u3001\u4e2d\u5fc3\u5bf9\u79f0\u56fe\u5f62\u3002\u5bf9\u79f0\u8f74\u662f\u76f4\u5f84\u6240\u5728\u7684\u76f4\u7ebf\u3002
\u534a\u5f84\uff1a\u8fde\u63a5\u5706\u5fc3\u548c\u5706\u4e0a\u7684\u4efb\u610f\u4e00\u70b9\u7684\u7ebf\u6bb5\u53eb\u505a\u534a\u5f84\uff0c\u5b57\u6bcd\u8868\u793a\u4e3ar\uff08radius\uff09
\u76f4\u5f84\uff1a\u901a\u8fc7\u5706\u5fc3\u5e76\u4e14\u4e24\u7aef\u90fd\u5728\u5706\u4e0a\u7684\u7ebf\u6bb5\u53eb\u505a\u76f4\u5f84\uff0c\u5b57\u6bcd\u8868\u793a\u4e3ad\uff08diameter\uff09\u3002\u76f4\u5f84\u6240\u5728\u7684\u76f4\u7ebf\u662f\u5706\u7684\u5bf9\u79f0\u8f74\u3002\u5706\u7684\u76f4\u5f84 d=2r
C=\u5140d
C\u662f\u5468\u957f
d\u662f\u76f4\u5f84
字母公式：d=C÷π=C/π
D=L/兀
绛旓細瑙ｏ細璁鍛ㄩ暱C锛岀洿寰刣銆侰=蟺d d=C/蟺锛岃繖灏辨槸鎵姹傜殑鐩村緞鍏紡銆
绛旓細鍛ㄩ暱绠楃洿寰勫叕寮忔槸鐩村緞=鍛ㄩ暱梅蟺锛岀洿寰=鍛ㄩ暱梅2梅蟺=鍛ㄩ暱梅2蟺銆1銆宸茬煡鍦嗙殑鍛ㄩ暱姹傜洿寰勫叕寮锛氱洿寰=鍛ㄩ暱梅蟺锛屜鍙栧3.14銆2銆佸凡鐭ュ崐鍦嗙殑鍛ㄩ暱姹傜洿寰勫叕寮忥細R=C/2梅蟺=C/2蟺銆傚洜涓哄渾鐨勫懆闀=2蟺r锛宺涓哄崐寰勶紝鎵浠ュ崐鍦嗙殑鍛ㄩ暱=蟺r+2r锛宺涓哄崐寰勩傝鍦嗙殑鍛ㄩ暱涓篊锛屽垯鍗婂渾鍛ㄩ暱涓篊梅2=C/2锛屾墍浠...
绛旓細宸茬煡鍛ㄩ暱鍚庯紝鐩村緞=鍛ㄩ暱梅蟺銆傚叕寮忥細鐩村緞=鍛ㄩ暱梅蟺銆傚洜涓鍦嗙殑鍛ㄩ暱鍏紡涓猴細鍛ㄩ暱=蟺脳鐩村緞锛屽湪涓涓钩闈㈠唴锛屼竴鍔ㄧ偣浠ヤ竴瀹氱偣涓轰腑蹇冿紝浠ヤ竴瀹氶暱搴︿负璺濈鏃嬭浆涓鍛ㄦ墍褰㈡垚鐨勫皝闂洸绾垮彨鍋氬渾銆傚渾鏈夋棤鏁颁釜鐐广傚渾鏄竴绉嶅嚑浣曞浘褰鏍规嵁瀹氫箟锛岄氬父鐢ㄥ渾瑙勬潵鐢诲渾銆 鍚屽渾鍐呭渾鐨勭洿寰勩佸崐寰勯暱搴︽案杩滅浉鍚岋紝鍦嗘湁鏃犳暟鏉″崐寰...
绛旓細鍛ㄩ暱闄や互蟺銆傞氳繃鍦嗗舰鍛ㄩ暱璁＄畻鐩村緞鐨勫叕寮鏄細鐩村緞绛変簬鍛ㄩ暱闄や互蟺锛岃繖涓叕寮忔槸鍩轰簬鍦嗙殑鎬ц川寰楀嚭鐨勶紝鍦ㄥ渾涓紝鍛ㄩ暱涓庣洿寰勪箣闂村瓨鍦ㄤ竴涓浐瀹氱殑鍏崇郴锛屽嵆鍛ㄩ暱鎬绘槸绛変簬鐩村緞涔樹互蟺銆傚洜姝わ紝濡傛灉鐭ラ亾浜鍦嗙殑鍛ㄩ暱锛屽氨鍙互閫氳繃闄や互蟺鏉ヨ绠楀嚭鍦嗙殑鐩村緞銆
绛旓細鍦嗙殑鍛ㄩ暱姹傜洿寰勫叕寮锛欴 = 2 r銆1銆鍦嗗懆闀鏄寚缁曞渾涓鍛ㄧ殑闀垮害锛屽湪鍦嗕腑鍐呮帴涓涓n杈瑰舰锛岃竟闀胯涓篴n锛屾杈瑰舰鐨勫懆闀夸负n脳an锛屽綋n涓嶆柇澧炲ぇ鐨勬椂鍊欙紝姝ｈ竟褰㈢殑鍛ㄩ暱涓嶆柇鎺ヨ繎鍦嗙殑鍛ㄩ暱C鐨勬暟瀛︾幇璞★紝鍗筹細n瓒嬭繎浜庢棤绌凤紝C=n脳an銆2銆佸悗鏉ョ殑鏁板瀹朵滑灏辨兂鍔炴硶绠楀嚭杩欎釜蟺鐨勫叿浣撳硷紝鏁板瀹跺垬寰界敤鐨勬槸鈥...
绛旓細鍦嗙殑鍛ㄩ暱鍏紡涓篊锛堝懆闀匡級=2蟺r锛堝崐寰勶級鎴栬匔=蟺d锛鐩村緞锛夈傚洜姝わ紝鍦嗙殑鐩村緞d=C锛堝懆闀匡級/蟺銆傚叾涓鏄渾鍛ㄧ巼锛屾槸鏈夊浐瀹氭暟鍊肩殑锛屼竴鑸彇鍊枷=3.14銆傚渾锛氬渾鏄竴绉嶅嚑浣曞浘褰鏍规嵁瀹氫箟锛岄氬父鐢ㄥ渾瑙勬潵鐢诲渾銆傚悓鍦嗗唴鍦嗙殑鐩村緞銆佸崐寰勯暱搴︽案杩滅浉鍚岋紝鍦嗘湁鏃犳暟鏉″崐寰勫拰鏃犳暟鏉＄洿寰勩傚渾鏄酱瀵圭О銆佷腑蹇冨绉板浘褰
绛旓細鍦嗙殑鍛ㄩ暱鍏紡鏈変袱绉嶈〃杈惧舰寮忥紝涓绉嶆槸C=2蟺r锛屽叾涓瑿琛ㄧず鍛ㄩ暱锛宺琛ㄧず鍗婂緞銆傚彟涓绉嶆槸C=蟺d锛屽叾涓璬琛ㄧず鐩村緞銆1銆佸洜姝わ紝濡傛灉宸茬煡鍦嗙殑鍛ㄩ暱锛屽彲浠ラ氳繃涓婅堪鍏紡寰楀埌鐩村緞鐨闀垮害銆傚叿浣撴搷浣滀负锛氬渾鐨勭洿寰刣=鍛ㄩ暱C/蟺銆傝繖閲岀殑蟺鏄竴涓父鏁帮紝绾︾瓑浜3.14銆備篃灏辨槸璇达紝濡傛灉浣犳湁涓涓渾锛屽苟鐭ラ亾浜嗗畠鐨勫懆闀匡紝浣犲彲浠...
绛旓細鐭ラ亾鍦嗗懆闀鎬庝箞姹傜洿寰勭殑鍏紡浠嬬粛濡備笅锛氱煡鍛ㄩ暱姹傜洿寰勭殑鍏紡鏄痙=C/蟺鐩村緞鏄寚閫氳繃涓骞抽潰鍥惧舰鎴栫珛浣撲腑蹇冨埌杈逛笂涓ょ偣闂寸殑璺濈锛岄氬父鐢ㄥ瓧姣嶁渄鈥濊〃绀恒傝繛鎺ュ渾鍛ㄤ笂涓ょ偣骞堕氳繃鍦嗗績鐨勭嚎娈电О鍦嗙洿寰锛岃繛鎺ョ悆闈笂涓ょ偣骞堕氳繃鐞冨績鐨勭洿绾跨О鐞冪洿寰勩傚杈瑰舰鐨勫懆闀跨殑闀垮害涔熺浉绛変簬鍥惧舰鎵鏈夎竟鐨勫拰锛鍦嗙殑鍛ㄩ暱锛澫d=2蟺rd涓...
绛旓細鐩村緞=鍛ㄩ暱梅鍦嗗懆鐜 d=C梅蟺 鐩村緞鏄50锛姹傚懆闀 鍦嗙殑鍛ㄩ暱鍏紡锛氬渾鐨勫懆闀緾=蟺X鐩村緞=蟺X鍗婂緞X2锛埾=3.14锛夊綋鍦嗙殑鐩村緞涓50鏃禨=3.14X50=157 浜轰滑鍦ㄧ粡楠屼腑鍙戠幇鍦嗙殑鍛ㄩ暱涓庣洿寰勬湁鐫涓涓父鏁扮殑姣旓紝骞舵妸杩欎釜甯告暟鍙仛鍦嗗懆鐜囥備簬鏄嚜鐒跺湴锛鍦嗗懆闀灏辨槸锛欳=蟺X鐩村緞鎴栬呄X鍗婂緞X2銆傚悗鏉ョ殑鏁板瀹朵滑灏辨兂...
绛旓細鍦嗙殑鍛ㄩ暱鍏紡涓篊锛堝懆闀匡級=2蟺r锛堝崐寰勶級鎴栬匔=蟺d锛鐩村緞锛夈傚洜姝わ紝鍦嗙殑鐩村緞d=C锛堝懆闀匡級/蟺銆傚叾涓鏄渾鍛ㄧ巼锛屾槸鏈夊浐瀹氭暟鍊肩殑锛屼竴鑸彇鍊枷=3.14銆傚渾鏄竴绉嶅嚑浣曞浘褰鏍规嵁瀹氫箟锛岄氬父鐢ㄥ渾瑙勬潵鐢诲渾銆 鍚屽渾鍐呭渾鐨勭洿寰勩佸崐寰勭殑闀垮害姘歌繙鐩稿悓锛屽渾鏈夋棤鏁版潯鍗婂緞鍜屾棤鏁版潯鐩村緞銆傚渾鏄酱瀵圭О銆佷腑蹇冨绉板浘褰...
