将圆平均分成若干个小扇形,简拼成一个近似的长方形。如果圆的半径是10cm,阴影部分的周长和面积各是多少？
\u628a\u4e00\u4e2a\u76f4\u5f84\u4e3ad\u5398\u7c73\u7684\u5706\u5f62\u7eb8\u7247\u6cbf\u534a\u5f84\u5206\u6210\u82e5\u5e72\u4efd\uff0c\u7136\u540e\u7b80\u62fc\u6210\u4e00\u4e2a\u8fd1\u4f3c\u957f\u65b9\u5f62\uff0c\u957f\u65b9\u5f62\u7684\u5468\u957f\u662f\uff08\uff09\u5398\u7c73\uff0c\u628a\u4e00\u4e2a\u76f4\u5f84\u4e3ad\u5398\u7c73\u7684\u5706\u5f62\u7eb8\u7247\u6cbf\u534a\u5f84\u5206\u6210\u82e5\u5e72\u4efd\uff0c\u7136\u540e\u7b80\u62fc\u6210\u4e00\u4e2a\u8fd1\u4f3c\u957f\u65b9\u5f62\uff0c\u957f\u65b9\u5f62\u7684\u5468\u957f\u662f\uff08d\u03c0+d\uff09\u5398\u7c73\uff0c
\u5047\u8bbe\u5706\u534a\u5f84\u4e3ar
\u957f\u65b9\u5f62\u5468\u957f\u4e3a\u5706\u5468\u957f+\u76f4\u5f84=2\u03c0r+2r
\u22352\u03c0r+2r-2\u03c0r=2r=10
\u2234r=5
\u957f\u65b9\u5f62\u9762\u79ef=5\u03c0+5
面积3.14×10×10=314平方厘米
绛旓細浣犲ソ锛鍦鐨勫崐寰=10梅2=5锛堝帢绫筹級杩欎釜骞宠鍥涜竟褰㈢殑闈㈢Н=鍦嗙殑闈㈢Н=3.14脳5²=78.5锛堝钩鏂瑰帢绫筹級
绛旓細鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰鎷兼垚涓涓繎浼奸暱鏂瑰舰闀挎槸鍗婁釜鍦嗗懆闀匡紝瀹芥槸鍗婂緞 鍛ㄩ暱姣斿師鏉ュ鍔犱簡8cm锛屽嵆浜屼釜鍗婂緞鏄8鍘樼背锛屾晠鍗婂緞锛8锛2锛4 杩欎釜鍦嗙殑闈㈢Н鏄3銆14锛4锛4锛50銆24骞虫柟鍘樼背
绛旓細鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰鍚庢嫾鎴愮殑闀挎柟褰㈢殑闀跨瓑浜庡渾鐨勫懆闀跨殑涓鍗婏紝瀹界瓑浜庡渾鐨勫崐寰勶紝鎵浠ュ渾鐨勫崐寰=2/2=1鍘樼背锛屽渾鐨勯潰绉=3.14*1*1=3.14骞虫柟鍘樼背銆
绛旓細鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰鎷兼垚涓涓繎浼奸暱鏂瑰舰闀挎槸鍗婁釜鍦嗗懆闀匡紝瀹芥槸鍗婂緞 鍛ㄩ暱姣斿師鏉ュ鍔犱簡8cm锛屽嵆浜屼釜鍗婂緞鏄8鍘樼背锛屾晠鍗婂緞锛8锛2锛4 杩欎釜鍦嗙殑闈㈢Н鏄3銆14锛4锛4锛50銆24骞虫柟鍘樼背
绛旓細鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰鍚庡壀寮,鍙嫾鎴愪竴涓繎浼肩殑闀挎柟褰,杩欎釜闀挎柟褰㈢殑闀跨浉褰撲簬鍦嗗懆闀跨殑(涓鍗)銆傚洜涓哄渾鎷兼垚闀挎柟褰㈡椂锛屼笂锛堜笅锛夐潰鐨勯暱鏄渾鍛ㄩ暱鐨勪竴鍗婏紝鍗婂緞鎴愪簡闀挎柟褰㈢殑瀹姐
绛旓細澶氬嚭鏉ョ殑6鍘樼背鍗充负鍗婂緞鐨勪袱鍊嶏紝鎵浠ラ潰绉负 3.14脳(6梅2)²=3.14脳9 =28.26锛堝钩鏂瑰帢绫筹級
绛旓細浣犵殑鍥惧憿锛屾垜鐚滀綘鐨勯槾褰遍儴鍒嗗簲璇ユ槸涓婂簳鎴栦笅搴曞惂锛屽鏋滄槸鐨勮瘽锛岃繎浼奸暱鏂瑰舰鐨勪笂搴曞拰涓嬪簳灏辨槸鍘熷渾鏌辩殑涓婂簳鍜屼笅搴曪紝涔熷氨鏄眰鍦嗗舰鐨勫懆闀垮拰闈㈢Н浜嗭細鍛ㄩ暱锛2蟺r锛2*3.14*10锛31.4 闈㈢Н锛毾r锛堝钩鏂癸級锛3.14*10*10锛314
绛旓細c闀 =c鍦+2r =2蟺r+2r =r锛2蟺+2锛=16.56 r=16.56/锛2蟺+2锛塻鍦=蟺r^2=蟺 锛16.56/2蟺+2锛塩闀-c鍦=2r=10 r=5 s闀=s鍦=蟺r^2=25蟺锛堟寜杩戜技闀挎柟褰㈢畻锛塻闀=2蟺r/2路r=25蟺锛堟寜闀挎柟褰㈢畻锛夐兘鏄25蟺 ...
绛旓細鍦鐨勫崐寰勬槸41.4梅2-15.7=5(鍘樼背)鍦嗙殑鍛ㄩ暱鏄2脳3.14脳5=31.4(鍘樼背)闈㈢Н鏄3.14脳5脳5=78.5(骞虫柟鍘樼背)
绛旓細鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰,鍐嶆嫾鎴愪竴涓繎浼肩殑闀挎柟褰,杩欎釜闀挎柟褰㈢殑闀挎槸6.28鍒嗙背鍦嗙殑闈㈢Н瑕佹湁绠楀紡鎬ュ晩鍟婂晩... 鎶婁竴涓渾骞冲潎鍒嗘垚鑻ュ共涓皬鎵囧舰,鍐嶆嫾鎴愪竴涓繎浼肩殑闀挎柟褰,杩欎釜闀挎柟褰㈢殑闀挎槸6.28鍒嗙背 鍦嗙殑闈㈢Н瑕佹湁绠楀紡 鎬ュ晩鍟婂晩 灞曞紑 2涓洖绛 #鐑# 宸插濂虫у氨搴旇鎵挎媴瀹堕噷澶ч儴鍒嗗鍔″悧?鍖垮悕...
