求下面各图形中阴影部分的面积
\u6c42\u4e0b\u9762\u5404\u56fe\u5f62\u4e2d\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef\u3002\u5229\u7528\u5272\u8865\u6cd5\u5c06\u53f3\u4e0a\u89d2\u5706\u5f27\u9634\u5f71\u90e8\u5206\u8865\u5230\u53f3\u4e0b\u89d2\uff0c\u518d\u7528\u5927\u76f4\u89d2\u4e09\u89d2\u5f62\u9762\u79ef\u51cf\u53bb\u534a\u5706\u5185\u63a5\u4e09\u89d2\u5f62\u9762\u79ef\uff0c\u5f97\u7b54\u6848\uff0c\u53ea\u56e0\u770b\u4e0d\u6e05\u76f4\u5f84\u4e0d\u80fd\u505a\u7b54
\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
=(40+25)/2
=65/2
=32.5(平方厘米)
答：
阴影面积=两个正方形面积之和 - 空白三角形面积 - 空白梯形面积
=8×8+5×5-5×5÷2-(8-5+8)×8÷2
=64+25-12.5-44
=89-56.5
=32.5平方厘米
绛旓細绛旓細闃村奖閮ㄥ垎鐨勯潰绉鏄40骞虫柟鍒嗙背锛
绛旓細=50-25蟺/2
绛旓細闃村奖閮ㄥ垎鐨勯潰绉 = 澶у渾鐨勫洓鍒嗕箣涓 - 杈归暱涓10鐨勪笁瑙掑舰鐨勯潰绉 = 蟺r²/4 - r²/2 = 25蟺 - 50 = 28.5 锛堥潰绉崟浣嶏級
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绛旓細闃村奖閮ㄥ垎闈㈢Н=姊舰闈㈢Н+涓涓崐鍦嗛潰绉--涓涓櫧鑹蹭笁瑙掑舰闈㈢Н--涓涓櫧鑹插崐鍦嗛潰绉 =姊舰闈㈢Н鈥斾竴涓櫧鑹蹭笁瑙掑舰闈㈢Н
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
绛旓細闃村奖閮ㄥ垎鍛ㄩ暱=鍗婂緞涓6cm鐨勫渾鐨勫懆闀跨殑1/4 鐨 2鍊 =2*(2*6*pi*1/4)=6pi =18.84cm锛堢涓涓浘锛闃村奖閮ㄥ垎鐨勯潰绉 =鍗婂緞涓6cm鐨勫渾鐨勯潰绉殑1/4 鐨 2鍊 - 姝ｆ柟褰㈤潰绉 =2*(6*6*pi*1/4)-6*6 =18pi-36 = 20.52 cm骞虫柟 锛堢涓涓浘锛夌浜屼釜鍥炬眰闈㈢Н=鍗婂緞涓10cm/2=5cm鐨勫渾鐨勯潰绉...
绛旓細闃村奖闈㈢Н=姊舰闈㈢Н-鍥涘垎涔嬩竴鍦嗛潰绉 姊舰闈㈢Н=锛堜笂搴+涓嬪簳锛壝楅珮梅2=锛4+6锛壝4梅2=20 鍥涘垎涔嬩竴鍦嗛潰绉=锛埾脳r脳r锛壝4=锛3.14脳4脳4锛壝4=12.56 闃村奖闈㈢Н=20-12.56=7.44
