请问圆的面积怎样计算，谢谢 圆的面积怎样算，公式是什么？谢谢。

\u5706\u7684\u9762\u79ef\u600e\u4e48\u7b97\uff0c\u8c22\u8c22

\u5706\u7684\u9762\u79ef\u8ba1\u7b97\u516c\u5f0f\uff1a \u6216 \uff08r\u4e3a\u534a\u5f84\uff0cd\u4e3a\u76f4\u5f84\uff0cd=2r\uff09
\u5176\u4ed6\u5173\u4e8e\u5706\u7684\u516c\u5f0f\uff1a
\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\u3002
\u5f27\u957f\u89d2\u5ea6\u516c\u5f0f
\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

\u6247\u5f62\u9762\u79ef\u516c\u5f0f
R\u662f\u6247\u5f62\u534a\u5f84\uff0cn\u662f\u5f27\u6240\u5bf9\u5706\u5fc3\u89d2\u5ea6\u6570\uff0c\u03c0\u662f\u5706\u5468\u7387\uff0cL\u662f\u6247\u5f62\u5bf9\u5e94\u7684\u5f27\u957f\u3002
\u4e5f\u53ef\u4ee5\u7528\u6247\u5f62\u6240\u5728\u5706\u7684\u9762\u79ef\u9664\u4ee5360\u518d\u4e58\u4ee5\u6247\u5f62\u5706\u5fc3\u89d2\u7684\u89d2\u5ea6n\uff0c\u5982\u4e0b\uff1a\uff08L\u4e3a\u5f27\u957f\uff0cR\u4e3a\u6247\u5f62\u534a\u5f84\uff09
\u63a8\u5bfc\u8fc7\u7a0b:S=\u03c0r²\u00d7L/2\u03c0r=LR/2(L=\u2502\u03b1\u2502\u00b7R)

\u6269\u5c55\u8d44\u6599\uff1a

\u5706\u7684\u6027\u8d28\uff1a
\u2474\u5706\u662f\u8f74\u5bf9\u79f0\u56fe\u5f62\uff0c\u5176\u5bf9\u79f0\u8f74\u662f\u4efb\u610f\u4e00\u6761\u901a\u8fc7\u5706\u5fc3\u7684\u76f4\u7ebf\u3002\u5706\u4e5f\u662f\u4e2d\u5fc3\u5bf9\u79f0\u56fe\u5f62\uff0c\u5176\u5bf9\u79f0\u4e2d\u5fc3\u662f\u5706\u5fc3\u3002
\u5782\u5f84\u5b9a\u7406\uff1a\u5782\u76f4\u4e8e\u5f26\u7684\u76f4\u5f84\u5e73\u5206\u8fd9\u6761\u5f26\uff0c\u5e76\u4e14\u5e73\u5206\u5f26\u6240\u5bf9\u76842\u6761\u5f27\u3002
\u5782\u5f84\u5b9a\u7406\u7684\u9006\u5b9a\u7406\uff1a\u5e73\u5206\u5f26\uff08\u4e0d\u662f\u76f4\u5f84\uff09\u7684\u76f4\u5f84\u5782\u76f4\u4e8e\u5f26\uff0c\u5e76\u4e14\u5e73\u5206\u5f26\u6240\u5bf9\u76842\u6761\u5f27\u3002
\u2475\u6709\u5173\u5706\u5468\u89d2\u548c\u5706\u5fc3\u89d2\u7684\u6027\u8d28\u548c\u5b9a\u7406
\u2460 \u5728\u540c\u5706\u6216\u7b49\u5706\u4e2d\uff0c\u5982\u679c\u4e24\u4e2a\u5706\u5fc3\u89d2\uff0c\u4e24\u4e2a\u5706\u5468\u89d2\uff0c\u4e24\u7ec4\u5f27\uff0c\u4e24\u6761\u5f26\uff0c\u4e24\u6761\u5f26\u5fc3\u8ddd\u4e2d\u6709\u4e00\u7ec4\u91cf\u76f8\u7b49\uff0c\u90a3\u4e48\u4ed6\u4eec\u6240\u5bf9\u5e94\u7684\u5176\u4f59\u5404\u7ec4\u91cf\u90fd\u5206\u522b\u76f8\u7b49\u3002
\u2461\u5728\u540c\u5706\u6216\u7b49\u5706\u4e2d\uff0c\u76f8\u7b49\u7684\u5f27\u6240\u5bf9\u7684\u5706\u5468\u89d2\u7b49\u4e8e\u5b83\u6240\u5bf9\u7684\u5706\u5fc3\u89d2\u7684\u4e00\u534a\uff08\u5706\u5468\u89d2\u4e0e\u5706\u5fc3\u89d2\u5728\u5f26\u7684\u540c\u4fa7\uff09\u3002
\u76f4\u5f84\u6240\u5bf9\u7684\u5706\u5468\u89d2\u662f\u76f4\u89d2\u300290\u5ea6\u7684\u5706\u5468\u89d2\u6240\u5bf9\u7684\u5f26\u662f\u76f4\u5f84\u3002
\u5706\u5fc3\u89d2\u8ba1\u7b97\u516c\u5f0f\uff1a\u3000\u03b8=(L/2\u03c0r)\u00d7360\u00b0=180\u00b0L/\u03c0r=L/r(\u5f27\u5ea6)\u3002
\u5373\u5706\u5fc3\u89d2\u7684\u5ea6\u6570\u7b49\u4e8e\u5b83\u6240\u5bf9\u7684\u5f27\u7684\u5ea6\u6570\uff1b\u5706\u5468\u89d2\u7684\u5ea6\u6570\u7b49\u4e8e\u5b83\u6240\u5bf9\u7684\u5f27\u7684\u5ea6\u6570\u7684\u4e00\u534a\u3002
\u2462 \u5982\u679c\u4e00\u6761\u5f27\u7684\u957f\u662f\u53e6\u4e00\u6761\u5f27\u76842\u500d\uff0c\u90a3\u4e48\u5176\u6240\u5bf9\u7684\u5706\u5468\u89d2\u548c\u5706\u5fc3\u89d2\u662f\u53e6\u4e00\u6761\u5f27\u76842\u500d\u3002
\u2476\u6709\u5173\u5916\u63a5\u5706\u548c\u5185\u5207\u5706\u7684\u6027\u8d28\u548c\u5b9a\u7406
\u2460\u4e00\u4e2a\u4e09\u89d2\u5f62\u6709\u552f\u4e00\u786e\u5b9a\u7684\u5916\u63a5\u5706\u548c\u5185\u5207\u5706\u3002\u5916\u63a5\u5706\u5706\u5fc3\u662f\u4e09\u89d2\u5f62\u5404\u8fb9\u5782\u76f4\u5e73\u5206\u7ebf\u7684\u4ea4\u70b9\uff0c\u5230\u4e09\u89d2\u5f62\u4e09\u4e2a\u9876\u70b9\u8ddd\u79bb\u76f8\u7b49\uff1b
\u2461\u5185\u5207\u5706\u7684\u5706\u5fc3\u662f\u4e09\u89d2\u5f62\u5404\u5185\u89d2\u5e73\u5206\u7ebf\u7684\u4ea4\u70b9\uff0c\u5230\u4e09\u89d2\u5f62\u4e09\u8fb9\u8ddd\u79bb\u76f8\u7b49\u3002
\u2462R=2S\u25b3\u00f7L\uff08R\uff1a\u5185\u5207\u5706\u534a\u5f84\uff0cS\uff1a\u4e09\u89d2\u5f62\u9762\u79ef\uff0cL\uff1a\u4e09\u89d2\u5f62\u5468\u957f\uff09\u3002
\u2463\u4e24\u76f8\u5207\u5706\u7684\u8fde\u5fc3\u7ebf\u8fc7\u5207\u70b9\u3002\uff08\u8fde\u5fc3\u7ebf\uff1a\u4e24\u4e2a\u5706\u5fc3\u76f8\u8fde\u7684\u76f4\u7ebf\uff09
\u2464\u5706O\u4e2d\u7684\u5f26PQ\u7684\u4e2d\u70b9M\uff0c\u8fc7\u70b9M\u4efb\u4f5c\u4e24\u5f26AB\uff0cCD\uff0c\u5f26AC\u4e0eBD\u5206\u522b\u4ea4PQ\u4e8eX\uff0cY\uff0c\u5219M\u4e3aXY\u4e4b\u4e2d\u70b9\u3002
\uff084\uff09\u5982\u679c\u4e24\u5706\u76f8\u4ea4\uff0c\u90a3\u4e48\u8fde\u63a5\u4e24\u5706\u5706\u5fc3\u7684\u7ebf\u6bb5\uff08\u76f4\u7ebf\u4e5f\u53ef\uff09\u5782\u76f4\u5e73\u5206\u516c\u5171\u5f26\u3002
\uff085\uff09\u5f26\u5207\u89d2\u7684\u5ea6\u6570\u7b49\u4e8e\u5b83\u6240\u5939\u7684\u5f27\u7684\u5ea6\u6570\u7684\u4e00\u534a\u3002
\uff086\uff09\u5706\u5185\u89d2\u7684\u5ea6\u6570\u7b49\u4e8e\u8fd9\u4e2a\u89d2\u6240\u5bf9\u7684\u5f27\u7684\u5ea6\u6570\u4e4b\u548c\u7684\u4e00\u534a\u3002
\uff087\uff09\u5706\u5916\u89d2\u7684\u5ea6\u6570\u7b49\u4e8e\u8fd9\u4e2a\u89d2\u6240\u622a\u4e24\u6bb5\u5f27\u7684\u5ea6\u6570\u4e4b\u5dee\u7684\u4e00\u534a\u3002
\uff088\uff09\u5468\u957f\u76f8\u7b49\uff0c\u5706\u9762\u79ef\u6bd4\u6b63\u65b9\u5f62\u3001\u957f\u65b9\u5f62\u3001\u4e09\u89d2\u5f62\u7684\u9762\u79ef\u5927\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1----\u5706

设圆半径为r
圆周率π
面积S=πr^2
周长C=2πr
我是对的

派R平方，派等于3.14，R是圆的半径



派r方。派：3.14，r是圆的半径

鍦嗙殑闈㈢Н鎬庝箞绠?璋㈣阿
绛旓細鍦嗙殑闈㈢Нs=r*r*蟺

鍦嗙殑闈㈢Н鎬庝箞姹傚叕寮忔槸浠涔璋㈣阿
绛旓細鍦嗙殑鍗婂緞涓簉 鍒闈㈢Н涓篠=蟺r² 灏辨槸蟺涔樹互鍗婂緞鐨勫钩鏂癸紝蟺鍊兼牴鎹鎰忕湅鍙栧嚑浣嶆暟锛屼竴鑸彇蟺=3.14

鎬庢牱姹鍦嗙殑闈㈢Н
绛旓細鍦嗙殑闈㈢Н绛変簬 S=蟺r^2 r灏辨槸鍗婂緞

鍦嗙殑闈㈢Н璁＄畻鍏紡?
绛旓細鍗婂緞鐨勫钩鏂规垚浠ュ渾鍛ㄧ巼 S=蟺r²

鍦嗙殑闈㈢Н鎬庝箞绠?
绛旓細鎶婂渾骞冲潎鍒嗘垚鑻ュ共浠斤紝鍙互鎷兼垚涓涓繎浼肩殑闀挎柟褰傞暱鏂瑰舰鐨勫灏辩瓑浜庡渾鐨勫崐寰勶紙r锛夛紝闀挎柟褰㈢殑闀垮氨鏄渾鍛ㄩ暱锛圕锛夌殑涓鍗娿傞暱鏂瑰舰鐨勯潰绉槸ab锛岄偅鍦嗙殑闈㈢Н灏辨槸锛氬渾鐨勫崐寰勶紙r锛変箻浠ヤ簩鍒嗕箣涓鍛ㄩ暱C锛孲=r*C/2=r*蟺r銆傚渾鍛ㄩ暱鍏紡锛氬渾鍛ㄩ暱锛圕锛夛細鍦嗙殑鐩村緞锛坉锛夛紝閭ｅ渾鐨勫懆闀匡紙C锛夐櫎浠ュ渾鐨勭洿寰勶紙d锛...

鍦嗙殑闈㈢Н璁＄畻鍏紡
绛旓細S=蟺r?鎴朣=蟺*锛坉/2)?銆俽锛氬渾鐨勫崐寰勩俤锛氬渾鐨勭洿寰勩傁锛氬渾鍛ㄧ巼锛屾槸鏃犻檺涓嶅惊鐜皬鏁帮紝涓鑸彇鍊3.14銆傜害缈板凹鏂峰紑鏅嫆杩愮敤鏃犵┓鍒嗗壊娉曪紝姹傚嚭浜嗚澶氬浘褰鐨勯潰绉銆1615骞达紝浠栧皢鑷繁鍒涢犵殑杩欑姹鍦嗛潰绉鐨勬柊鏂规硶锛屽彂琛ㄥ湪銆婅憽钀勯厭妗剁殑绔嬩綋鍑犱綍銆嬩竴涔︿腑銆備粬鎶婂渾鍒嗗壊鎴愭棤绌峰涓皬鎵囧舰锛屽苟鏋滄暍鍦版柇瑷锛氭棤绌...

鍦嗙殑闈㈢Н鎬庝箞绠浜,鍛靛懙,蹇樿浜
绛旓細鎮ㄥソ 鍦嗙殑闈㈢Н=蟺r²r鏄崐寰勶紝蟺鏄渾鍛ㄧ巼 鏈涢噰绾锛岃阿璋锛

璇烽棶鎬庢牱璁＄畻鍦嗙殑闈㈢Н
绛旓細鍦嗛潰绉鍏紡鏄渾鍛ㄧ巼*鍗婂緞鐨勫钩鏂 S=蟺r²

璇烽棶鍦嗗舰鍛ㄩ暱鍜闈㈢Н鎬庝箞璁＄畻
绛旓細鍦嗙殑鍛ㄩ暱=鍦嗗懆鐜嚸楃洿寰 c=蟺d 鍦嗙殑鍛ㄩ暱=鍦嗗懆鐜嚸2脳鍗婂緞 c=2蟺r 鍦嗙殑闈㈢Н=鍦嗗懆鐜嚸楀崐寰勭殑骞虫柟 s=蟺r2 娉⊿:闈㈢Н C:鍛ㄩ暱 d=鐩村緞 r=鍗婂緞 婊℃剰璇烽噰绾筹紝O(鈭鈭)O璋㈣阿锛

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