求半圆的周长和面积 半圆的面积和周长的计算公式(急求啊!!!!)
\u600e\u4e48\u6c42\u534a\u5706\u7684\u5468\u957f\u548c\u9762\u79ef\u4f60\u597d\uff0c\u534a\u5706\u7684\u9762\u79ef
=\u76f8\u540c\u534a\u5f84\u7684\u5706\u7684\u9762\u79ef\u7684\u4e00\u534a
=\u03c0r²/2
\u534a\u5706\u7684\u5468\u957f
=\u76f8\u540c\u534a\u5f84\u7684\u5706\u7684\u5468\u957f\u7684\u4e00\u534a+\u5706\u7684\u76f4\u5f84
=2\u03c0r/2+2r
=\u03c0r+2r
=\uff08\u03c0+2)r
\u4f60\u53ef\u4ee5\u53c2\u8003\u4e0b\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u7528\uff01\u5982\u679c\u5bf9\u4f60\u6709\u7528\uff0c\u8bf7\u7ed9\u4e88\u201c\u597d\u8bc4\u201d\u4f5c\u4e3a\u5bf9\u6211\u7684\u9f13\u52b1\uff0c\u8c22\u8c22\uff01
\u534a\u5706\u7684\u5468\u957f\uff1aC = \u03c0r +2r (\u5706\u5468\u957f\u7684\u4e00\u534a+\u76f4\u5f84)
\u534a\u5706\u7684\u9762\u79ef\uff1aS=\u03c0r² \u00f72 \uff08\u5706\u9762\u79ef\u7684\u4e00\u534a\uff09
\u534a\u5706\u7684\u5706\u5f27\u603b\u662f\u6d4b\u91cf180\u00b0\uff08\u76f8\u5f53\u4e8e\u03c0\u5f27\u5ea6\u6216\u534a\u5708\uff09\u3002 [1] \u5b83\u53ea\u6709\u4e00\u6761\u5bf9\u79f0\u7ebf\uff08\u53cd\u5c04\u5bf9\u79f0\uff09\u3002\u5706\u7684\u4efb\u610f\u4e00\u6761\u76f4\u5f84\u7684\u4e24\u4e2a\u7aef\u70b9\u628a\u5706\u5206\u6210\u4e24\u6761\u5f27\uff0c\u6bcf\u4e00\u6761\u5f27\u90fd\u53eb\u505a\u534a\u5706\u3002\u534a\u5706\u8981\u548c\u534a\u5706\u5f62\u5206\u5f00\uff0c\u56e0\u4e3a\u534a\u4e2a\u5706\u53ea\u662f\u4e00\u4e2a\u5f27\u3002\u5b83\u662f\u5706\u7684\u4e00\u534a\uff0c\u534a\u5706\u5f62\u7684\u5706\u5fc3\u7684\u4f4d\u7f6e\u662f\u5b83\u540c\u5fc3\u5706\u7684\u5706\u5fc3\u7684\u4f4d\u7f6e\uff0c\u53ea\u6709\u4e00\u6761\u76f4\u5f84\uff0c\u4f46\u6709\u65e0\u6570\u6761\u534a\u5f84\uff0c\u6709\u4e00\u6761\u5bf9\u79f0\u8f74\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u534a\u5706\u53ef\u7528\u4e8e\u4f7f\u7528\u76f4\u8fb9\u548c\u7f57\u76d8\u6784\u9020\u4e24\u4e2a\u957f\u5ea6\u7684\u7b97\u672f\u548c\u51e0\u4f55\u5e73\u5747\u503c\u3002 \u5982\u679c\u6211\u4eec\u5236\u4f5c\u76f4\u5f84\u4e3aa+ b\u7684\u534a\u5706\uff0c\u90a3\u4e48\u534a\u5f84\u7684\u957f\u5ea6\u662fa\u548cb\u7684\u7b97\u672f\u5e73\u5747\u503c\uff08\u7531\u4e8e\u534a\u5f84\u662f\u76f4\u5f84\u7684\u4e00\u534a\uff09\u3002 \u53ef\u4ee5\u901a\u8fc7\u5c06\u76f4\u5f84\u5206\u6210\u957f\u5ea6\u4e3aa\u548cb\u7684\u4e24\u4e2a\u6bb5\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u7684\u5171\u540c\u7aef\u70b9\u8fde\u63a5\u5230\u5177\u6709\u5782\u76f4\u4e8e\u76f4\u5f84\u7684\u6bb5\u7684\u534a\u5706\u4e0a\u6765\u627e\u5230\u51e0\u4f55\u5e73\u5747\u503c\u3002
\u6240\u5f97\u5230\u7684\u6bb5\u7684\u957f\u5ea6\u662f\u51e0\u4f55\u5e73\u5747\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u6bd5\u8fbe\u54e5\u62c9\u65af\u5b9a\u7406\u6765\u8bc1\u660e\u3002 \u8fd9\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u77e9\u5f62\u7684\u6b63\u4ea4\uff08\u56e0\u4e3a\u5176\u8fb9\u7b49\u4e8e\u77e9\u5f62\u7684\u8fb9\u7684\u51e0\u4f55\u5e73\u5747\u503c\u7684\u6b63\u65b9\u5f62\u5177\u6709\u4e0e\u77e9\u5f62\u76f8\u540c\u7684\u9762\u79ef\uff09\uff0c\u5e76\u4e14\u56e0\u6b64\u53ef\u4ee5\u6784\u9020\u4e00\u4e2a\u77e9\u5f62\u7684\u77e9\u5f62 \u76f8\u7b49\u7684\u533a\u57df\uff0c\u5982\u4efb\u4f55\u591a\u8fb9\u5f62\uff08\u4f46\u4e0d\u662f\u4e00\u4e2a\u5706\uff09\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a
\u767e\u5ea6\u767e\u79d1-\u534a\u5706
(1)周长3.14×10×1/2+10
=15.7+10
=25.7(厘米)
面积3.14×(10/2)²×1/2
=3.14×12.5
=39.25(平方厘米)
(2)周长3.14×8+8×2
=25.12+16
=41.12(分米)
面积3.14×8²×1/2
=3.14×32
=100.48(平方分米)
半圆周长
C1=d+πd/2=25.7厘米
C2=d+πd/2=41.12分米
半圆面积
S1=πR^2/2=39.25平方厘米
S2=πR^2/2=100.48平方分米
采纳哈
1、周长=5π,面积为=12.5π;2、周长=8π,面积=64π。
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