用18.84米的篱笆靠墙围成了一个半圆形的养鸡场，这个养鸡场的面积是多少平方米？（算式）
\u752818.84\u7c73\u7684\u7bf1\u7b06\u9760\u5899\u56f4\u6210\u4e86\u4e00\u4e2a\u534a\u5706\u5f62\u7684\u517b\u9e21\u573a\uff0c\u8fd9\u4e2a\u517b\u9e21\u573a\u7684\u9762\u79ef\u662f\u591a\u5c11\u5e73\u65b9\u7c73\uff1f\u5c0f\u5f00\u5fc3888\uff0c\u4f60\u597d\uff1a
\u517b\u9e21\u573a\u7684\u534a\u5f84\u4e3a\uff1a
18.84\u00f73.14\uff1d6\uff08\u7c73\uff09
\u517b\u9e21\u573a\u7684\u9762\u79ef\u4e3a\uff1a
3.14\u00d76\u00d76\u00f72\uff1d56.52\uff08\u5e73\u65b9\u7c73\uff09
\uff081\uff09\u7531\u534a\u5706\u5f62=18.84\u7c73\uff0c
\u2234\u5706\u5468\u957f=18.84\u00d72=37.68\u7c73\uff0c
\uff082\uff09\u534a\u5f84=37.68\u00f73.14\u00f72=6\u7c73
\uff083\uff09\u534a\u5706\u9762\u79efS=6²\u03c0\u00f72=18\u03c0=56.54\uff08\u5e73\u65b9\u7c73\uff09\u3002
大缸的直径为：R=18.84÷6÷π= 1（米）
盖子的面积是：(R/2)²π=(1/2)²X3.14=0.785(平方米)
绛旓細宸茬煡鍗婂渾鐨勫姬闀=娲緍=18.84绫,鎵浠=18.84/3.14=6绫,闈㈢Н=娲*6*6/2=56.52骞虫柟绫炽傚凡鐭ュ渾鐨勫懆闀=18.84/6=3.14绫=2*娲*r锛屾墍浠=0.5绫筹紝鎵浠ラ潰绉=娲*r骞虫柟=3.14*0.25=0.785骞虫柟绫.
绛旓細鍦嗙殑鍛ㄩ暱鍏紡 l=2蟺r 鍥犱负鍥存垚鍗婂渾 闀夸负18.84 閭ｄ箞杩欎釜鍗婂渾鐨勫崐寰剅=18.84/3.14=6绫虫墍浠ュ崐鍦嗙殑闈㈢Н=蟺r鐨勫钩鏂归櫎浠2=3.14X36/2=56.52骞虫柟绫
绛旓細鍒樺ぇ浼鐢18.84绫闀鐨勭绗嗛潬澧欏洿涓涓崐鍦嗗舰鐨勫吇楦″満锛岃繖涓吇楦″満鐨勯潰绉槸56.52骞虫柟绫炽傛牴鎹鎰忚绠楋細鍗婂緞 = 18.84x2/2蟺 = 6m 鍏婚浮鍦洪潰绉 = 6x6蟺/2 = 18蟺 鈮56.52 鎵浠ヨ繖涓吇楦″満鐨勯潰绉槸56.52骞虫柟绫炽備箻娉曡繍绠楁ц川锛氬嚑涓暟鐨勭Н涔樹竴涓暟锛屽彲浠ヨ绉噷鐨勪换鎰忎竴涓洜鏁颁箻杩欎釜鏁帮紝鍐嶅拰...
绛旓細14.13锛2蟺r涔樹互浜屽垎涔嬩竴鍔犱笂2r=18.84锛宺=3 蟺r鐨勫钩鏂逛箻浠ヤ簩鍒嗕箣涓=14.13
绛旓細18.84脳2梅3.14梅2 =12梅2 =6锛堢背锛3.14脳6脳6梅2 =3.14脳18 =56.52锛堝钩鏂圭背锛
绛旓細鍏婚浮鎯ㄧ洿寰勪负18.84*2梅3.14=12M 鍗婂緞涓6M 鎵浠ラ潰绉负3.14*6*6梅2=56.52銕
绛旓細鍥犱负鍗婂渾鐨勫懆闀=鍦嗗懆闀跨殑涓鍗+ 涓鏉＄洿寰 鈭18.84=鍦嗗懆鐜嚸楀崐寰+2脳鍗婂緞 鈭村崐寰勨増3.7 鈭撮潰绉=3.14脳3.7²=3.14脳3.7脳3.7鈮43
绛旓細18.84*3.14=6绫3.14*6*6=113.04骞虫柟绫 绛斿崰鍦伴潰绉槸113.04绫炽
绛旓細56.52骞虫柟绫 鍒樺ぇ鐖鐢18.84绫闀鐨勭绗嗛潬澧欏洿浜涓涓崐鍦嗗舰鐨勯浮鑸嶏紝鍙緱锛氬崐寰18.84梅3.14=6绫 闈㈢Н3.14脳6²脳1/2=3.14脳18=56.52骞虫柟绫
绛旓細18.84/3.14=6 鍒欏崐寰勪负6绫 闈㈢Н涓6*6*3.14/2=56.52骞虫柟绫
