求圆内直径9米2,高3米85,底和圆的平方面积多少。一个圆形井直径9米2,高3米85,求它的底和圆 一个圆直径3.5米怎么样计算除掉内直径2.9米,剩下外圆面积...
\u4e00\u4e2a\u5706\u67f1\u5f62\u6c34\u6c60,\u5916\u5706\u76f4\u5f849\u7c73,\u5185\u5706\u76f4\u5f848\u7c73,\u9ad82\u7c73,\u8868\u9762\u548c\u5e95\u9762\u9576\u4e0a\u74f7\u7816\uff0c\u9576\u74f7\u7816\u7684\u9762\u79ef\u662f\u591a\u5c119\u00f72=4.5\u7c73 8\u00f72=4\u7c73
\u03c0\u00d7\uff084.5\u00d74.5-4\u00d74\uff09=6.25\u03c0\u5e73\u65b9\u7c73
\u03c0\u00d7\uff089+8\uff09\u00d72=34\u03c0\u5e73\u65b9\u7c73
34\u03c0+6.25\u03c0=40.25\u03c0=40.25\u00d73.14=126.385\u5e73\u65b9\u7c73
\u5269\u4f59\u9762\u79ef=\u03c0[(3.5/2)²-(2.9/2)²]
=\u03c0(3.5²-2.9²)/4
=\u03c0(3.5+2.9)(3.5-2.9)/4
=\u03c0\u00d76.4\u00d70.6/4
=0.96\u03c0
\u22483.0159289474462015(m²)
3.14*(9.2/2)的平方=66.4424平方米
圆壁面积=底面周长*高=3.14*9.2*3.85=111.2188平方米
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