王阿姨用长12.56米的篱笆沿一面墙围了一个半圆形鸡舍，这个鸡舍的占地面积是多少平方米？
\u5f20\u5927\u4f2f\u7528\u957f12.56\u7c73\u7684\u7bf1\u7b06\u6cbf\u4e00\u9762\u5899\u56f4\u4e00\u4e2a\u534a\u5706\u5f62\u7684\u9e21\u820d\uff0c\u9e21\u820d\u5360\u5730\u9762\u79ef\u591a\u5c11\u8be5\u534a\u5706\u662f\u9760\u5899\u5373\u76f4\u5f84\u90e8\u5206\u4e0d\u7528\u7bf1\u7b06
\u534a\u5706\u5468\u957f\u4e3ac=2*3.14*r/2
\u5373 r=12.56/(2*3.14/2\uff09=4
\u6839\u636e\u5706\u9762\u79ef\u516c\u5f0fS=3.14*r*r =3.14*4*4=50.24
\u8be5\u534a\u5706\u9762\u79ef\u4e3aS\u534a=50.14/2=25.12\u5e73\u65b9\u7c73
\u8be5\u9e21\u820d\u5360\u573025.12\u5e73\u65b9\u7c73\u3002\
\u540c\u5b66\u60a8\u597d\uff0c\u5982\u679c\u95ee\u9898\u5df2\u89e3\u51b3\uff0c\u8bb0\u5f97\u91c7\u7eb3\u54e6~~~\u60a8\u7684\u91c7\u7eb3\u662f\u5bf9\u6211\u7684\u80af\u5b9a~
\u4eb2\uff0c\u65b0\u76841\u5e74\u5f00\u59cb\uff0c\u795d\u597d\u4e8b\u63a52\u8fde3\uff0c\u5fc3\u60c54\u5b63\u5982\u6625\uff0c\u751f\u6d3b5\u989c6\u8272\uff0c7\u5f69\u7f24\u7eb7\uff0c\u5076\u5c148\u70b9\u5c0f\u8d22\uff0c\u70e6\u607c\u629b\u52309\u9704\u4e91\u5916!
\u5148\u7b97\u51fa\u4e24\u4e2a\u5706\u5f27\u7684\u957f\u5ea6\uff0c\u4e5f\u5c31\u662f\u5468\u957f\uff1a12.56*2=25.12\uff08\u5e73\u65b9\u7c73\uff09\u518d\u7b97\u534a\u5f84\uff1ar=c/\u03c0=25.12/6.28=4\uff08\u7c73\uff09\u534a\u5706\u5f62\u7684\u9762\u79ef\uff1as=\u03c0r\u7684\u5e73\u65b9=3.14*4*4=50.24\uff08\u7c73\uff09\uff0c\u671b\u697c\u4e3b\u91c7\u7eb3\uff01\uff01\uff01
先求出半径，因为12.56是个半圆，所以12.56除以3.14=4米，面积就是4的平方乘以3.12再除以2等于25.12米。鸡舍面积是25.12
50.215
绛旓細鐜嬪ぇ鐖风敤12.56m闀跨殑绡辩瑔鍥翠簡涓涓崐鍦嗙殑楦¤垗锛岃繖涓浮鑸嶉潬澧欑殑涓杈归暱澶氬皯锛12.56梅3.14脳2 =4脳2 =8绫
绛旓細鑺卞潧鐨勫崐寰勬槸锛12.56脳2梅3.14梅2=4锛堢背锛夎姳鍧涚殑闈㈢Н鏄細4脳4脳3.14梅2=25.12锛堝钩鏂圭背锛
绛旓細鍛ㄩ暱 12.56x2=25.12 蟺=3.14 鍦嗙殑鍛ㄩ暱鍏紡C锛2蟺 r r=4 鍦嗙殑闈㈢Н鍏紡S锛澫 r² 鍗婂渾=25.12骞崇背
绛旓細鍥犱负鍥存爮鏄潬澧欏缓鐨勬墍浠ュ彧瑕佹妸绡辩瑔鍥存垚鍗婂渾 12.56/3.14=4绫充负姝ゅ崐鍦嗙殑鍗婂緞 S鍗婂渾=3.14*4^2/2=25.12骞虫柟绫
绛旓細瑙:灏卞洿鍗婂湀,杩樻湁涓杈规槸澧 R=12.56/3.14=4(M)S=1/2 3.14*4*4=25.12M^2
绛旓細鐢ㄤ竴鏉闀12.56m鐨勭绗鍥村煄涓涓渾褰㈤浮鑸,杩欎釜楦¤垗鐨勫崐寰勬槸澶氬皯绫?瑙ｏ細宸茬煡鍦嗙殑鍛ㄩ暱L涓庡崐寰勭殑鍏崇郴鏄細L=2蟺r r=L/2蟺=12.56/2x3.14 =12.56/6.28 =2绫.绛旓細杩欎釜楦¤垗鐨勫崐寰勬槸2绫炽
绛旓細鍗婂緞锛12.56/(3.14x2)=2绫 闈㈢Н锛1/2x3.14x2x2=6.28骞虫柟绫
绛旓細12.56梅3.14=4锛堢背锛 3.14脳4 2 梅2 =50.24梅2 =25.12锛堝钩鏂圭背锛 绛旓細楦″満鐨勯潰绉槸25.12骞虫柟绫筹紟
绛旓細12.56梅3.14梅2=2绫 3.14X2X2梅2=6.28骞虫柟绫
绛旓細璇ュ崐鍦嗘槸闈犲鍗崇洿寰勯儴鍒嗕笉鐢绡辩瑔 鍗婂渾鍛ㄩ暱涓篶=2*3.14*r/2 鍗 r=12.56/(2*3.14/2锛=4 鏍规嵁鍦嗛潰绉叕寮廠=3.14*r*r =3.14*4*4=50.24 璇ュ崐鍦嗛潰绉负S鍗=50.14/2=25.12骞虫柟绫 璇ラ浮鑸嶅崰鍦25.12骞虫柟绫炽俓 鍚屽鎮ㄥソ锛屽鏋滈棶棰樺凡瑙ｅ喅锛岃寰楅噰绾冲摝~~~鎮ㄧ殑閲囩撼鏄鎴戠殑鑲畾~浜诧紝鏂扮殑...
