一扇门的门框要装上如图所示的装饰木条,需要多少米?(结果保留两位小数)C:\Documents and Settings\123456\桌面\YP20130214204001.jpeg
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![一扇门的门框要装上如图所示的装饰木条,需要多少米?(结果保留两位小数)C:\Documents and Settings\123456\桌面\YP20130214204001.jpeg](/uploads/image/z/12181865-41-5.jpg?t=%E4%B8%80%E6%89%87%E9%97%A8%E7%9A%84%E9%97%A8%E6%A1%86%E8%A6%81%E8%A3%85%E4%B8%8A%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E8%A3%85%E9%A5%B0%E6%9C%A8%E6%9D%A1%2C%E9%9C%80%E8%A6%81%E5%A4%9A%E5%B0%91%E7%B1%B3%3F%EF%BC%88%E7%BB%93%E6%9E%9C%E4%BF%9D%E7%95%99%E4%B8%A4%E4%BD%8D%E5%B0%8F%E6%95%B0%EF%BC%89C%3A%5CDocuments+and+Settings%5C123456%5C%E6%A1%8C%E9%9D%A2%5CYP20130214204001.jpeg)
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一扇门的门框要装上如图所示的装饰木条,需要多少米?(结果保留两位小数)C:\Documents and Settings\123456\桌面\YP20130214204001.jpeg
一扇门的门框要装上如图所示的装饰木条,需要多少米?(结果保留两位小数)
C:\Documents and Settings\123456\桌面\YP20130214204001.jpeg
一扇门的门框要装上如图所示的装饰木条,需要多少米?(结果保留两位小数)C:\Documents and Settings\123456\桌面\YP20130214204001.jpeg
因此,需要的木材的长度是三面=平方+半圆.
下部正方形的周长= 3×50 =150厘米
上半圆的弧长=π×25 =25πcm
所以需要木材的长度= 150 +25 =π228.5厘米