求下面各图中阴影部分的面积
\u6c42\u4e0b\u9762\u5404\u56fe\u4e2d\u9634\u5f71\u90e8\u5206\u9762\u79ef\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff01\uff081\uff09\u4e09\u89d2\u5f62\u5185\u89d2\u548c180\u00b0\uff0c\u5373\u4e09\u4e2a\u6247\u5f62\u7684\u5706\u5fc3\u89d2\u548c\u4e3a180\u00b0\uff0c\u4e14\u534a\u5f84\u90fd\u662f4
\u2234S=(180/360)*\u03c0*4^2=8\u03c0
\uff082\uff09\u9634\u5f71\u90e8\u5206\u662f\u6b63\u65b9\u5f62\u51cf\u53bb1/4\u5706\uff08\u5de6\u8fb9\uff09+1/4\u5706\uff08\u53f3\u8fb9\uff09
\u2234\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef\u5c31\u662f\u6b63\u65b9\u5f62\u7684\u9762\u79ef
\u2234S=10^2=100
\u68af\u5f62\u7684\u9ad8\u4e3a\u534a\u5706\u7684\u534a\u5f84 \u800c\u4e0a\u5e95\u4e3a\u76f4\u5f84 \u6240\u4ee5\u4e0a\u5e95\u4e3a2*8=16
\u68af\u5f62\u9762\u79ef\u4e3a \uff08\u4e0a\u5e95+\u4e0b\u5e95\uff09*\u9ad8\u9664\u4ee52 \u534a\u5706\u7684\u9762\u79ef=\u03c0*r\u7684\u5e73\u65b9\u9664\u4ee52
\u9634\u5f71\u90e8\u5206\u9762\u79ef=\u68af\u5f62\u9762\u79ef-\u534a\u5706\u9762\u79ef
=1/2×3.14×6²+1/2×3.14×8²+12×16÷2-1/2×3.14×10²
=1/2×3.14×（6²+8²-10²）+12×8
=96（平方厘米）
a=6 b=8 c=10
面积=1/2(πa2+πb2-πc2)
绛旓細1.闃村奖閮ㄥ垎闈㈢Н=澶у渾-涓棿绌虹櫧灏忓渾 澶у渾闈㈢Н=16蟺 灏忓渾闈㈢Н=4蟺 鎵浠ワ紝闃村奖閮ㄥ垎闈㈢Н绛変簬=12蟺 2.闃村奖閮ㄥ垎闈㈢Н=1/2锛堝ぇ鍦-涓棿绌虹櫧灏忓渾锛夊ぇ鍦嗛潰绉=蟺[锛8+1+1锛/2]^2=25蟺 灏忓渾闈㈢Н=16蟺 鎵浠ワ紝闃村奖閮ㄥ垎闈㈢Н绛変簬=1/2锛25蟺-16蟺锛=9/2蟺 濡傛灉婊℃剰锛岃璁板緱 鐐瑰嚮鏈〉闈腑鐨勨滈変负婊℃剰鍥炵瓟...
绛旓細闃村奖閮ㄥ垎鐨勯潰绉=鍥涘垎涔嬩竴鍦嗛潰绉+姝ｆ柟褰㈤潰绉-姗欒壊涓夎褰㈤潰绉-鍥涘垎涔嬩竴鍦嗛潰绉 =姝ｆ柟褰㈤潰绉-姗欒壊涓夎褰㈤潰绉=姗欒壊涓夎褰㈤潰绉 =6脳6梅2=18骞虫柟鍘樼背
绛旓細锛堜笁锛変笁瑙掑舰鐨勯潰绉細6脳6梅2锛18锛堝钩鏂瑰帢绫筹級锛堝洓锛夆滃崐鍙垛濈殑闈㈢Н鍙互鐢ㄥ洓鍒嗕箣涓鍦嗙殑闈㈢Н鍑忓幓绛夎叞鐩磋涓夎褰㈢殑闈㈢Н锛屼篃灏辨槸锛氾紙6 脳6 脳3.14 梅4 锛夛紞锛6脳6梅2锛夛紳10.26锛堝钩鏂瑰帢绫筹級锛堜簲锛夌敤涓夎褰㈢殑闈㈢Н鍔犱笂鈥滃崐鍙垛濓細18 锛10.26 锛28.26锛堝钩鏂瑰帢绫筹級绛旓細鍥句腑闃村奖閮ㄥ垎鐨勯潰绉鏄...
绛旓細闃村奖閮ㄥ垎闈㈢Н锛濇褰㈤潰绉紞涓夎褰㈤潰绉 锛濓紙10+20锛*5/2锛10*5/2 =75-25 =50骞虫柟鍘樼背
绛旓細涓ら亾棰橀兘鍙互鐢ㄧ浉鍑忔硶鏉ユ眰瑙ｏ紝鐢ㄥ師鍥惧舰鐨勯潰绉噺鍘荤┖鐧介儴鍒嗙殑闈㈢Н灏卞彲浠ュ緱鍒闃村奖閮ㄥ垎鐨勯潰绉銆傚浘1銆佸師鍥惧舰姊舰闈㈢НS锛堟锛=锛6+12锛壝8梅2=72dm²绌虹櫧閮ㄥ垎骞宠鍥涜竟褰㈤潰绉疭锛堝钩锛=6脳8=48dm²闃村奖閮ㄥ垎闈㈢НS锛堥槾锛=S锛堟锛-S锛堝钩锛=72-48=24dm²绛旓細闃村奖閮ㄥ垎闈㈢НS锛堥槾锛=24dm...
绛旓細甯綘鏍囨敞涓嬶紝灏卞緢瀹规槗鐪嬫噦浜嗭細1銆闃村奖闈㈢Н=S姊舰ABCD=(6+18)*18/2=24*9=216锛2銆侀槾褰遍潰绉=S鈻矨EF+S姝ｆ柟褰BCF-S鈻矱BC =18*18/2+6*6-24*6/2 =162+36-72=126
绛旓細涓婂浘锛氭棆杞叾涓竴涓彲鎷兼垚涓婂浘銆俽=20梅2=10 闃村奖闈㈢Н=鍗婂渾闈㈢Н-鎷兼垚鐨勭┖鐧戒笁瑙掑舰闈㈢Н =10脳10脳3.14梅2-10脳10梅2 =314-50 =264锛涗笅鍥撅細涓婇潰涓ゅ潡榛戣壊閮ㄥ垎姝ｅソ濉湪榛勮壊閮ㄥ垎锛涚洿寰=5脳2=10锛屼笅杈圭殑x=d=10锛屾褰㈢殑涓嬪簳=10+10=20锛涢珮=鍗婂緞=5 闃村奖闈㈢Н=姊舰闈㈢Н-绌虹櫧涓夎褰㈤潰绉 =锛10+20...
绛旓細锛1锛変袱涓鏂瑰舰鐨勯潰绉拰锛9脳9+6脳6=117锛堝钩鏂瑰帢绫筹級锛涗袱涓笁瑙掑舰鐨勯潰绉拰锛9脳9梅2+6脳锛6+9锛壝2锛=40.5+45锛=85.5锛堝钩鏂瑰帢绫筹級锛117-85.5=31.5锛堝钩鏂瑰帢绫筹級锛庣瓟锛闃村奖閮ㄥ垎鐨勯潰绉31.5骞虫柟鍘樼背锛庯紙2锛夐槾褰遍儴鍒嗙殑闈㈢Н锛10.5脳4梅2锛=10.5脳2锛=21锛堢珛鏂瑰帢绫筹級锛庣瓟锛氶槾褰遍儴鍒...
绛旓細绗竴骞呭浘 S闃村奖=7.5脳5梅2=18.75锛堝钩鏂瑰帢绫筹級绗簩骞呭浘 S闃村奖=20脳25梅2=250锛堝钩鏂瑰帢绫筹級
绛旓細S=(8*5+5*5)/2 =(40+25)/2 =65/2 =32.5(骞虫柟鍘樼背)
