圆的方程中r指的是半径还是直径 在圆形中“R”是直径还是半径
R\u6307\u7684\u662f\u534a\u5f84\u8fd8\u662f\u76f4\u5f84R \u662f\u82f1\u6587 Radius\uff08\u534a\u5f84\uff09\u7684\u9996\u5b57\u6bcd\u7f29\u5199\uff0c\u6240\u4ee5\uff0c\u4e00\u822c\u90fd\u7528 R (\u6216\u8005 r )\u6765\u8868\u793a\u534a\u5f84\u3002
\u534a\u5f84\uff1a\u6570\u5b66\u51e0\u4f55\u4e2d\u7684\u672f\u8bed\uff0c\u610f\u4e3a\u5706\u4e0a\u6700\u957f\u7684\u4e24\u70b9\u95f4\u8ddd\u79bb\u7684\u4e00\u534a\u3002\u79f0\u4e3a\u534a\u5f84\uff0c\u76f4\u5f84\u662f\u534a\u5f84\u76842\u500d\uff0c\u76f8\u5f53\u4e8e\u534a\u5f84\u4e58\u4e0a2\u7b49\u4e8e\u76f4\u5f84\u3002
\u76f4\u5f84\uff1a\u662f\u6307\u901a\u8fc7\u4e00\u5e73\u9762\u56fe\u5f62\u6216\u7acb\u4f53\uff08\u5982\u5706\u3001\u5706\u9525\u622a\u9762\u3001\u7403\u3001\u7acb\u65b9\u4f53\uff09\u4e2d\u5fc3\u5230\u8fb9\u4e0a\u4e24\u70b9\u95f4\u7684\u8ddd\u79bb\uff0c\u901a\u5e38\u7528\u5b57\u6bcd\u201cd\u201d\u8868\u793a\u3002
\u5706\u7684\u5468\u957f\uff1a\u5728\u5706\u4e2d\u5185\u63a5\u4e00\u4e2a\u6b63n\u8fb9\u5f62\uff0c\u8fb9\u957f\u8bbe\u4e3aan\uff0c\u6b63\u8fb9\u5f62\u7684\u5468\u957f\u4e3a\uff1an*an\uff0c\u5f53n\u4e0d\u65ad\u589e\u5927\u7684\u65f6\u5019\uff0c\u6b63\u8fb9\u5f62\u7684\u5468\u957f\u4e0d\u65ad\u63a5\u8fd1\u5706\u7684\u5468\u957fC\u3002\u8ba1\u7b97\uff1a\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\uff1aC = \u03c0 * d \u6216\u8005C=2*\u03c0*r\uff08\u5176\u4e2dd\u662f\u5706\u7684\u76f4\u5f84\uff0cr\u662f\u5706\u7684\u534a\u5f84\uff09\u3002
\u5706\u5468\u7387\uff1a\u7528\u03c0\u6765\u8868\u793a\uff0c\u6570\u5b66\u5bb6\u5218\u5fbd\u7528\u7684\u662f\u201c\u5272\u5706\u672f\u201d\u7684\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u7528\u5706\u7684\u5185\u63a5\u6b63\u591a\u8fb9\u5f62\u548c\u5916\u5207\u6b63\u591a\u8fb9\u5f62\u7684\u5468\u957f\u903c\u8fd1\u5706\u5468\u957f\uff0c\u6c42\u5f97\u5706\u63a5\u8fd1192\u8fb9\u578b\uff0c\u6c42\u5f97\u5706\u5468\u7387\u5927\u7ea6\u662f3.14\u3002
R\u6307\u534a\u5f84\uff0c2R\u4e3a\u76f4\u5f84
r是半径，D是直径r是指圆的半径
半径 直径是d
半径
绛旓細r鏄崐寰锛孌鏄洿寰
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绛旓細1銆佸崐鍦嗙殑闈㈢Н锛歋鍗婂渾=(蟺r^2)/2銆锛坮涓哄崐寰勶級銆2銆佸渾鐜潰绉細S澶у渾-S灏忓渾=蟺(R^2-r^2)(R涓哄ぇ鍦嗗崐寰勶紝r涓哄皬鍦嗗崐寰)銆3銆佸渾鐨勫懆闀匡細C=2蟺r鎴朿=蟺d銆傦紙d涓虹洿寰勶紝r涓哄崐寰勶級銆4銆佸崐鍦嗙殑鍛ㄩ暱锛歞+(蟺d)/2鎴栬卍+蟺r銆傦紙d涓虹洿寰勶紝r涓哄崐寰勶級銆5銆佹墖褰㈠姬闀縇=鍦嗗績瑙掞紙寮у害鍒讹級脳R= ...
绛旓細鏍囧噯鏂圭▼鍦嗙殑鏍囧噯鏂圭▼涓猴細(x-a)^2+(y-b)^2=r^2 锛屽叾涓璦鍜宐鍒嗗埆鏄钩闈㈠潗鏍囩郴涓垎鍒窛绂粂杞村拰x杞寸殑璺濈锛屼篃鏄渾鐨勫渾蹇冨潗鏍囥r涓哄崐寰銆倄鍜寉鍊间唬琛ㄤ换鎰忎竴涓潗鏍囩偣,浣嗚婊¤冻x-a>0鍜寉-b>0銆傜敱姝ゆ牴鎹嬀鑲″畾鐞嗗彲寰楋細鍦嗗崐寰勫叕寮弐=鈭歔(x-a)^2+(y-b)^2]銆傚渾蹇冨潗鏍囦负锛坅,b锛夈傚渾鐨勪竴鑸...
绛旓細鍦嗗績鏄渾鐨勪腑蹇冪偣锛屽崐寰勬槸浠庡渾蹇冨埌鍦嗕笂浠绘剰涓鐐圭殑璺濈銆傚渾鐨勪竴鑸柟绋嬪彲浠ョ敤鏉ユ弿杩板钩闈笂鎵鏈夊埌鍦嗗績璺濈涓r鐨勭偣鐨勯泦鍚堬紝杩欎釜闆嗗悎灏辨槸鍦嗐傚湪涓鑸鏂圭▼涓锛(x-a)琛ㄧず鐐(x,y)鍒板渾蹇冪殑姘村钩璺濈锛(y-b)琛ㄧず鐐(x,y)鍒板渾蹇冪殑鍨傜洿璺濈锛宺琛ㄧず鍦嗙殑鍗婂緞銆傚洜姝わ紝鏂圭▼宸﹁竟鐨勫钩鏂瑰拰绛変簬r鐨勫钩鏂癸紝灏辨槸鎵鏈夊埌...
绛旓細鍦嗗彲浠ヨ〃绀轰负闆嗗悎{M||MO|=r},鍦嗙殑鏍囧噯鏂圭▼鏄(x - a) ² + (y - b) ² = r ²銆傚叾涓,(a , b)鏄渾蹇,r 鏄崐寰銆 鍦嗗舰鏄竴绉嶅渾閿ユ洸绾,鐢卞钩琛屼簬鍦嗛敟搴曢潰鐨勫钩闈㈡埅鍦嗛敟寰楀埌銆 鍦嗘槸涓绉嶅嚑浣曞浘褰傛牴鎹畾涔,閫氬父鐢ㄥ渾瑙勬潵鐢诲渾銆 鍚屽渾鍐鍦嗙殑鐩村緞銆佸崐寰勯暱搴︽案杩滅浉鍚,鍦嗘湁鏃犳暟鏉″崐寰勫拰鏃犳暟鏉＄洿寰...
绛旓細鍦嗙殑鍛ㄩ暱=2蟺r=蟺d锛屽叾涓璻涓鸿鍦嗙殑鍗婂緞锛宒涓鸿鍦嗙殑鐩村緞锛屜鏄渾鍛ㄧ巼锛屾槸涓涓父鏁帮紝绾︾瓑浜3.14锛屾墍浠ュ彧瑕佺煡閬撳渾鐨勫崐寰勬垨鑰呯洿寰勫氨鍙互姹傚嚭鍦嗙殑鍛ㄩ暱浜嗐傚彟澶栵紝鍦嗙殑闈㈢Н璁＄畻鍏紡涓簊=蟺r²
绛旓細2銆佸崐寰勶細浠庡渾蹇冨埌鍦嗕笂浠绘剰涓鐐圭殑璺濈灏辨槸鍦嗙殑鍗婂緞銆3銆佺洿寰勶細閫氳繃鍦嗗績骞朵笖涓ょ閮藉湪鍦嗕笂鐨勭嚎娈靛氨鏄鍦嗙殑鐩村緞銆4銆佸渾鐨勫懆闀匡細鍦嗗懆闀挎槸鎸囩粫鍦嗕竴鍛ㄧ殑闀垮害銆傚畠鐨勫叕寮忎负C=2蟺r锛屽叾涓鏄渾鍛ㄧ巼锛r鏄渾鐨勫崐寰銆5銆佸渾鐨勯潰绉細鍦嗛潰绉槸鎸囧渾鎵鍗犳嵁鐨勫钩闈㈠尯鍩熺殑澶у皬銆傚畠鐨勫叕寮忎负S=蟺r^2锛屽叾涓鏄渾鍛ㄧ巼...
绛旓細鍦嗙殑鏍囧噯鏂圭▼鏄寚浠ュ潗鏍囩郴鐨勫師鐐逛负鍦嗗績鐨勫渾鐨勬柟绋銆傛爣鍑嗘柟绋嬭〃杈句负锛歺² + y² = r²锛屽叾涓璻涓哄渾鐨勫崐寰銆備竴鑸柟绋嬪垯鏄寚鍦嗗績涓嶅湪鍧愭爣鍘熺偣鏃剁殑鍦嗙殑鏂圭▼锛岃〃杈句负锛(x-a)² + (y-b)² = r²锛屽叾涓(a, b)涓哄渾蹇冪殑鍧愭爣銆3. 瑙ｄ竴鍏冧簩娆℃柟绋嬪緱鍒板渾鐨勬柟绋 ...
