如何制作圆锥形铁皮桶,底部直径930mm,上部直径1000mm,高度为1050mm,如何画出扇形图?如何计算扇形的弧长? 如何制作圆锥形铁皮桶,底部直径500mm,上部直径180mm...
\u5982\u4f55\u5236\u4f5c\u5706\u9525\u5f62\u94c1\u76ae\u6876\uff0c\u5e95\u90e8\u76f4\u5f84500mm,\u4e0a\u90e8\u76f4\u5f84190mm,\u9ad8\u5ea6\u4e3a30mm,\u5982\u4f55\u753b\u51fa\u6247\u5f62\u56fe?\u5982\u4f55\u8ba1\u7b97\u7684\uff1f\u8c22\u8c22\uff01\u5982\u4f55\u5236\u4f5c\u5706\u9525\u5f62\u94c1\u76ae\u6876\uff0c\u5e95\u90e8\u76f4\u5f84d1=500mm,\u4e0a\u90e8\u76f4\u5f84d2=190mm,\u9ad8\u5ea6\u4e3ah=30mm,\u5982\u4f55\u753b\u51fa\u6247\u5f62\u56fe?\u6c42\u6247\u5f62\u7684\u5f27\u534a\u5f84R1\uff0cR2\u548c\u5f27\u6240\u5bf9\u7684\u5706\u5fc3\u89d2A\uff1f
R1-R2=(h^2+((d1-d2)/2)^2)^0.5=(30^2+((500-190)/2)^2)^0.5=157.88
A=PI*d1/R1=PI*d2/R2
d1/R1=d2/R2
500/R1=190/R2
R2=R1*(190/500)=R1*(19/50)
R1-R1*(19/50)=157.88
50*R1-19*R1=31*R1=157.88*50=7893.83
R1=7893.83/31=254.64mm
R2=R1*(19/50)=96.76
A=PI*d1/R1=PI*500/254.64=6.1687\u5f27\u5ea6=353.44\u5ea6
\u5c31\u50cf\u7eb8\u6247\u5b50\u4e0a\u5e16\u7684\u7eb8\u7684\u5f62\u72b6\uff1a
\u8fd9\u5f20\u56fe\u662f\u5c55\u5f00\u6765\u7684\u56fe\uff0c\u4e00\u4e2a\u77ed\u5f27\u534a\u5f84\uff0c\u4e00\u4e2a\u957f\u5f27\u534a\u5f84\uff0c\u8fd9\u4e24\u4e2a\u53c2\u6570\u91cd\u8981\u3002
按你的尺寸,画出来给你看看,是这样的
底边周长2921.68 顶部周长3141.60
就是圆周率的计算方法吗,圆的周长 = 直径× 圆周率 = 半径×2 ×圆周率
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