圆形的直径公式和半径公式 圆的面积公式等于什么，半径等于什么，直径
\u5706\u7684\u76f4\u5f84\u8ba1\u7b97\u516c\u5f0f\u5706\u7684\u76f4\u5f84=2\u00d7\u534a\u5f84
\u5706\u7684\u76f4\u5f84=\u5468\u957f\u00f7\u5706\u5468\u7387
\u6839\u636e\u9898\u76ee\u7ed9\u51fa\u7684\u6761\u4ef6\u6765\u8ba1\u7b97\uff0c\u4e0d\u540c\u7684\u6761\u4ef6\uff0c\u8ba1\u7b97\u65b9\u6cd5\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u6bd4\u5982\u7ed9\u51fa\u5706\u7684\u5468\u957f\u6216\u8005\u7ed9\u51fa\u534a\u5f84\uff0c\u90fd\u53ef\u4ee5\u7b97\u51fa\u5706\u7684\u76f4\u5f84\u3002
\u62d3\u5c55\u8d44\u6599
\u76f4\u5f84\uff0c\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\u8fde\u63a5\u5706\u5468\u4e0a\u4e24\u70b9\u5e76\u901a\u8fc7\u5706\u5fc3\u7684\u76f4\u7ebf\u79f0\u5706\u76f4\u5f84\uff0c\u8fde\u63a5\u7403\u9762\u4e0a\u4e24\u70b9\u5e76\u901a\u8fc7\u7403\u5fc3\u7684\u76f4\u7ebf\u79f0\u7403\u76f4\u5f84\u3002
1\u3001\u76f4\u5f84\u662f\u901a\u8fc7\u5706\u5fc3\u4e14\u4e24\u4e2a\u7aef\u70b9\u90fd\u5728\u5706\u4e0a\u4efb\u610f\u4e00\u70b9\u7684\u7ebf\u6bb5\uff0c.\u4e00\u822c\u7528\u5b57\u6bcdd\u8868\u793a\u3002
2\u3001\u76f4\u5f84\u6240\u5728\u7684\u76f4\u7ebf\u662f\u5706\u7684\u5bf9\u79f0\u8f74\u3002
3\u3001\u76f4\u5f84\u7684\u4e24\u4e2a\u7aef\u70b9\u5728\u5706\u4e0a\uff0c\u5706\u5fc3\u662f\u76f4\u5f84\u7684\u4e2d\u70b9\u3002\u76f4\u5f84\u5c06\u5706\u5206\u4e3a\u9762\u79ef\u76f8\u7b49\u7684\u4e24\u90e8\u5206,\u4e2d\u95f4\u7684\u7ebf\u6bb5\u5c31\u53eb\u76f4\u5f84\uff08\u6bcf\u4e00\u4e2a\u90e8\u5206\u6210\u4e3a\u4e00\u4e2a\u534a\u5706\uff09\u3002
\u5706\u5468\u7387=\u4e0c=3.14\uff0c\u534a\u5f84=r\uff0c\u76f4\u5f84=D
\u5706\u9762\u79ef=\u534a\u5f84X\u534a\u5f84x\u5706\u5468\u7387=r²\u4e0c
=(\u76f4\u5f84\u00f72)².x\u5706\u5468\u7387=(D/2)²\u4e0c
\u76f4\u5f84=\u534a\u5f84X2 \u5373D=2r
直径等于2倍半径
绛旓細鍦嗙殑鐩村緞濡備綍璁＄畻锛1銆佸渾鐨勭洿寰=鍗婂緞脳2锛坉=2r锛夈2銆佸渾鐨勭洿寰=鍦嗙殑鍛ㄩ暱梅蟺銆3銆佸亣璁炬湁鐐笰(x1,y1)鍜岀偣B(x2,y2)锛屽垯鍙互浣跨敤浠ヤ笅鍏紡璁＄畻杩欎袱鐐逛箣闂寸殑璺濈d锛歞=鈭歔(x2-x1)²+(y2-y1)²]锛屽緱鍒拌窛绂籨鍚庯紝鐩村緞鍙互閫氳繃灏嗚窛绂籨涔樹互2鏉ヨ绠椼傛墍浠ュ渾鐨勭洿寰勪负2d銆
绛旓細鍦嗙殑鐩村緞鍜屽崐寰鐨勪綔鐢 1銆佽绠楀渾鐨勫懆闀匡細鐩村緞鍜屽崐寰勬槸璁＄畻鍦嗙殑鍛ㄩ暱鐨勫叧閿弬鏁般傚懆闀挎槸鍦嗗懆鐨勯暱搴︼紝鍙互閫氳繃鐩村緞鎴栧崐寰勬潵璁＄畻銆傚鏋滅煡閬撶洿寰勶紝鍛ㄩ暱绛変簬鐩村緞涔樹互蟺锛堝渾鍛ㄧ巼锛夛紝濡傛灉鐭ラ亾鍗婂緞锛屽懆闀跨瓑浜庡崐寰勪箻浠2蟺銆2銆佽绠楀渾鐨勯潰绉細鐩村緞鍜屽崐寰勪篃鐢ㄤ簬璁＄畻鍦嗙殑闈㈢Н銆傚渾鐨勯潰绉瓑浜幭涔樹互鍗婂緞鐨勫钩鏂广傝繖涓鍏紡鏄...
绛旓細鍦嗗懆鐜=涓=3.14锛鍗婂緞=r锛鐩村緞=D 鍦嗛潰绉=鍗婂緞X鍗婂緞x鍦嗗懆鐜=r²涓 =(鐩村緞梅2)².x鍦嗗懆鐜=(D/2)²涓 鐩村緞=鍗婂緞X2 鍗矰=2r
绛旓細鍦嗙殑鐩村緞=鍗婂緞脳2濡傛灉娌″憡璇夊崐寰勫憡璇変簡鍛ㄩ暱锛岄偅灏辩敤鍛ㄩ暱闄や互3.14
绛旓細1銆佺粰鍗婂緞姹鍦嗙殑鐩村緞:d=2r 2銆佺粰鍛ㄩ暱姹傚渾鐨勭洿寰:d=c梅蟺 鍙互閫氳繃鍒诲害灏烘祴閲忋傞氳繃鍦嗗績杩炴帴鍦嗕笂鐨勪袱涓偣锛屾祴閲忎笁鐐瑰叡绾跨殑闀垮害銆
绛旓細c=蟺d=2蟺r 鍦嗙殑鍛ㄩ暱=鐩村緞脳鍦嗗懆鐜 s=蟺rr 鍦嗙殑闈㈢Н=鍗婂緞脳鍗婂緞脳鍦嗗懆鐜
绛旓細鍦嗙殑闈㈢Н鍏紡锛毾r骞虫柟锛鐩村緞鍏紡锛歞=2r锛鍗婂緞鍏紡锛歳=d/2
绛旓細鍗婂緞锛鐩村緞梅2 鎴 鍛ㄩ暱梅蟺梅2銆 鐩村緞锛氬崐寰劽2 -鎴 鍛ㄩ暱梅蟺銆傚懆闀匡細鐩村緞 脳蟺鎴栧崐寰劽2蟺 銆 闈㈢Н锛氾紙鐩村緞梅2锛夌殑骞虫柟 脳蟺 鎴栧崐寰勭殑骞虫柟脳蟺
绛旓細鍦嗗叕寮鍏ㄩ儴锛1銆佸渾闈㈢Н锛歋=蟺r锛孲=蟺(d/2)锛坉涓鐩村緞锛宺涓鍗婂緞锛夈2銆佸崐鍦嗙殑闈㈢Н锛歋鍗婂渾=(蟺r^2)/2銆3銆鍦嗙殑鍛ㄩ暱锛欳=2蟺r鎴朿=蟺d銆4銆佸崐鍦嗙殑鍛ㄩ暱锛歞+(蟺d)/2鎴栬卍+蟺r銆5銆佹墖褰㈡墍鍦ㄥ渾鐨勯潰绉櫎浠360鍐嶄箻浠ユ墖褰㈠渾蹇冭鐨勮搴锛歋=n/360脳蟺r銆傛ц川锛氬湪涓涓钩闈㈠唴锛屽洿缁曚竴涓偣骞...
绛旓細浣犻渶瑕佹槑鐧较鐨勫惈涔夛紝鍗冲渾鍛ㄩ暱涓庣洿寰鐨勬瘮鐜囥傚洜涓合鏄父鏁帮紝鎵浠ワ紝鐭ラ亾鍗婂緞鎴栫洿寰勶紝灏卞彲浠ユ眰鍑鍦嗙殑闈㈢Н鍜屽懆闀裤傜洿寰=2x鍗婂緞锛涢潰绉=蟺x鍗婂緞²锛涘懆闀=蟺x鐩村緞=2x蟺x鍗婂緞銆
