关于六年级数学图形求阴影面积的周长 六年级数学，求阴影部分的面积和周长
\u516d\u5e74\u7ea7\u6570\u5b66\uff0c\u8c22\u8c22\uff0c\u6c42\u9634\u5f71\u90e8\u5206\u9762\u79ef\u548c\u5468\u957f1\u3001
L=3.14x10+10+10+20=71.4
S=10x20-3.14x10x10\u00f72=43
2\u3001
L=3.14x10\u00f72+3.14x4\u00f72+\uff0810-4\uff09=27.98\u5398\u7c73
S=3.14x5x5\u00f72-3.14x2x2\u00f72=32.97\u5e73\u65b9\u5398\u7c73
\u670b\u53cb\uff0c\u8bf7\u3010\u91c7\u7eb3\u7b54\u6848\u3011\uff0c\u60a8\u7684\u91c7\u7eb3\u662f\u6211\u7b54\u9898\u7684\u52a8\u529b\uff0c\u8c22\u8c22\u3002
\u4e94\u30013.14\u00d75\u00d75\u00d710
=78.5\u00d710
=785\u7acb\u65b9\u5398\u7c73
1/3\u00d73.14\u00d76\u00d76\u00d720
=3.14\u00d7240
=753.6\u7acb\u65b9\u5398\u7c73
\u516d\u30011\u3001\u9762\u79ef3.14\u00d7\uff084/2\uff09²\u00d71/2+4\u00d76=6.28+24=30.28\u5e73\u65b9\u5206\u7c73
\u5468\u957f6\u00d72+4+3.14\u00d74\u00d71/2=12+4+6.28=22.28\u5206\u7c73
2\u3001\u9762\u79ef8²-3.14\u00d7\uff088/2\uff09²=64-50.24=13.76\u5e73\u65b9\u5206\u7c73
\u5468\u957f3.14\u00d78=25.12\u5206\u7c73
3\u3001\u9762\u79ef3.14\u00d7\u3010\uff0810/2\uff09²-\uff086/2\uff09²\u3011=3.14\u00d716=50.24\u5e73\u65b9\u5206\u7c73
\u5468\u957f3.14\u00d7\uff0810+6\uff09=3.14\u00d716=50.24\u5206\u7c73
阴影面积=4×4-3.14×（4÷2）²
=16-12.56
=3.44（cm²）
阴影周长=3.14×4+4+4=20.56（cm）
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