直径100mm的圆形周长是多少厘米 圆的直径是100mm.周长是多少？公式…？
1\u7c73\u76f4\u5f84\uff0c\u5706\u5f62\u5468\u957f\u662f\u591a\u5c11C=\u03c0d =3.14\u00d71=3.14\u7c73
\u5728\u53e4\u4ee3\uff0c\u8fd9\u4e2a\u95ee\u9898\u51e0\u4e4e\u662f\u4f9d\u8d56\u4e8e\u5bf9\u5b9e\u9a8c\u7684\u5f52\u7eb3\u3002\u4eba\u4eec\u5728\u7ecf\u9a8c\u4e2d\u53d1\u73b0\u5706\u7684\u5468\u957f\u4e0e\u76f4\u5f84\u6709\u7740\u4e00\u4e2a\u5e38\u6570\u7684\u6bd4\uff0c\u5e76\u628a\u8fd9\u4e2a\u5e38\u6570\u53eb\u505a\u5706\u5468\u7387\uff08\u897f\u65b9\u8bb0\u505a \u03c0 \uff09\u3002\u4e8e\u662f\u81ea\u7136\u5730\uff0c\u5706\u5468\u957f\u5c31\u662f\uff1a C=\u03c0d\u6216\u8005C=2\u03c0r \uff08\u5176\u4e2dd\u662f\u5706\u7684\u76f4\u5f84,r\u662f\u5706\u7684\u534a\u5f84\uff09\u3002
\u5272\u5706\u672f\u7684\u5927\u81f4\u65b9\u6cd5\u5728\u4e2d\u5b66\u7684\u6570\u5b66\u6559\u6750\u4e0a\u5c31\u6709\u3002\u7136\u800c\u5fc5\u987b\u770b\u5230\uff0c\u5b83\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53ea\u662f\u8ba1\u7b97\u5706\u5468\u7387\u7684\u65b9\u6cd5\uff0c\u800c\u5706\u5468\u957f\u662fC = \u03c0 * d\u4f3c\u4e4e\u5df2\u7ecf\u662f\u4e8b\u5b9e\u4e86\uff0c\u8fd9\u4e00\u65b9\u6cd5\u4ec5\u4ec5\u662f\u5b9a\u51fa\u03c0\u7684\u503c\u6765\u3002
\u6269\u5c55\u8d44\u6599\uff1a\u5706\u7684\u9762\u79ef\u8ba1\u7b97\u516c\u5f0f\uff1a \u6216
\u5706\u7684\u9762\u79ef\u6c42\u76f4\u5f84\uff1a
\u628a\u5706\u5206\u6210\u82e5\u5e72\u7b49\u4efd\uff0c\u53ef\u4ee5\u62fc\u6210\u4e00\u4e2a\u8fd1\u4f3c\u7684\u957f\u65b9\u5f62\u3002\u957f\u65b9\u5f62\u7684\u5bbd\u76f8\u5f53\u4e8e\u5706\u7684\u534a\u5f84\u3002
\u5706\u9525\u4fa7\u9762\u79ef \uff08l\u4e3a\u6bcd\u7ebf\u957f\uff09
\u6247\u5f62\u5f27\u957fL=\u5706\u5fc3\u89d2\uff08\u5f27\u5ea6\u5236\uff09\u00d7R= n\u03c0R/180\uff08\u03b8\u4e3a\u5706\u5fc3\u89d2\uff09\uff08R\u4e3a\u6247\u5f62\u534a\u5f84\uff09
\u6247\u5f62\u9762\u79efS=n\u03c0 R²/360=LR/2\uff08L\u4e3a\u6247\u5f62\u7684\u5f27\u957f\uff09
\u5706\u9525\u5e95\u9762\u534a\u5f84 r=nR/360\uff08r\u4e3a\u5e95\u9762\u534a\u5f84\uff09\uff08n\u4e3a\u5706\u5fc3\u89d2\uff09
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u5706
\u5706\u5468\u7387\u4e58\u4ee5\u76f4\u5f84\u7b49\u4e8e\u5468\u957f\u3002\u6211\u4eec\u901a\u5e38\u628a\u5706\u5468\u7387\u9ed8\u8ba4\u4e3a3.14\u3002\u6240\u4ee5\u5468\u957f\u662f3.14X100=314(mm) \u5f88\u9ad8\u5174\u4e3a\u4f60\u89e3\u7b54 \u8c22\u8c22\u91c7\u7eb3
周长是31.4厘米周长公式是C=π*D
C=3.14*100=314mm
周长是
100×π=314毫米
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~结果仅供参考~
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314毫米
绛旓細鍦嗗懆鐜囦箻浠ョ洿寰勭瓑浜庡懆闀裤傛垜浠氬父鎶婂渾鍛ㄧ巼榛樿涓3.14銆鎵浠ュ懆闀挎槸3.14X100=314(mm) 寰堥珮鍏翠负浣犺В绛 璋㈣阿閲囩撼
绛旓細鍛ㄩ暱鏄31.4鍘樼背
绛旓細鍦嗙殑鍐呮帴姝ｆ柟褰㈢殑瀵硅绾绛変簬鍦嗙殑鐩村緞锛屾牴鎹嬀鑲″畾鐞嗗彲鐭ワ紝姝ｆ柟褰㈠瑙掔嚎鐨勫钩鏂圭瓑浜庢鏂瑰舰杈归暱骞虫柟鐨2鍊嶏紝鍗100脳100=2脳杈归暱脳杈归暱锛屾墍浠ヨ竟闀跨瓑浜50鍊嶆牴鍙2銆
绛旓細100澶х殑姘寸,灏辨槸瀹冪殑鐩村緞鏄100mm,涓夊叕鍒嗗帤鐨勪繚娓╂潗鏂欎篃灏辨槸鍘氬害涓30mm.閭ｄ箞,淇濇俯涔嬪悗鐨鐩村緞涓100+30+30=160mm.鏍规嵁鍦嗙殑鍛ㄩ暱鍏紡,C=3.14*160=502.4mm.
绛旓細鍦嗗懆鐜囷紝鏄鍦嗙殑鍛ㄩ暱涓鐩村緞鐨姣斿硷紝甯哥敤甯岃厞瀛楁瘝 蟺 琛ㄧず銆傁 鏄竴涓湪鑷劧绉戝涓櫘閬嶅瓨鍦ㄧ殑鏁板甯告暟銆傁 = 鍛ㄩ暱/鐩村緞銆傝绠楁椂锛屜 鍙互涓ユ牸鍦板畾涔変负婊¤冻 sin x = 0 鐨勬渶灏忔瀹炴暟 x銆傁 鐨勮绠楀彲鏈夊绉嶈〃杈惧紡銆備緥濡傦紝蟺/4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 - 鈥︹ 锛堟棤绌峰椤癸級...
绛旓細榛樿鍗曚綅涓鑸槸姣背锛岀洿寰勶紳100姣背 鍛ㄩ暱锛澫脳D 锛3.14脳100 锛314姣背 锛31.4鍘樼背 100鍙ｅ緞閽㈢鐨勫鍛ㄩ暱鏄31.4鍘樼背銆
绛旓細v = 蟺 脳 D 脳 n / 1000 鍏朵腑锛寁 鏄垁鍏风嚎閫熷害锛堝崟浣嶏細m/min锛夛紝D 鏄瓟鐨鐩村緞锛堝崟浣嶏細mm锛夛紝n 鏄富杞磋浆閫燂紙鍗曚綅锛歳pm锛夈傚皢涓婅堪鍏紡鍙樺舰涓猴細n = v 脳 1000 / (蟺 脳 D)浠ｅ叆鏁版嵁寰楋細n = 25 脳 1000 / (蟺 脳 100) 鈮 795 rpm 鍥犳锛屼富杞磋浆閫熷簲璇ヤ笉瓒呰繃795 rpm浠ュ唴锛屾墠鑳芥弧瓒...
绛旓細锛25脳1000锛壝凤紙100脳3.14锛=25000梅314 =79.617834394904458598726114649682 绛旓細涓昏酱杞熷簲璇ユ槸80杞互鍐
绛旓細绗﹀悎鍥藉鏍囧噯鐨勩佽繎浜100澶栧緞鐨勯挗绠℃湁108mm涓114mm涓ょ锛岃繖涓ょ鐨勫寰鍛ㄩ暱绛変簬鍏剁洿寰勪箻蟺(3.1416)锛屽垯鍒嗗埆绾︽槸33.93鍘樼背涓35.81鍘樼背銆鍦嗗舰鐨勭墿浣撳鍦嗙殑鐩村緞绉颁负澶栧緞锛岄氬父鐩存帴娓告爣鍗″昂娴嬪緱锛岀鍙肺︺傚伐绋嬩笂锛屽寰勯氬父鏄川閲忛棶棰樼殑涓涓噸瑕佹寚鏍囷紝鍥犳瀵瑰叾娴嬮噺鏄竴涓潪甯搁噸瑕佺殑杩囩▼銆
绛旓細100澶х殑姘寸锛屽氨鏄畠鐨鐩村緞鏄100mm,涓夊叕鍒嗗帤鐨勪繚娓╂潗鏂欎篃灏辨槸鍘氬害涓30mm銆傞偅涔堬紝淇濇俯涔嬪悗鐨鐩村緞涓100+30+30=160mm銆傛牴鎹鍦嗙殑鍛ㄩ暱鍏紡锛孋=3.14*160=502.4mm銆傛湜閲囩撼銆
