关于圆锥的表面积
\u5706\u9525\u4f53\u7684\u8868\u9762\u79ef\u516c\u5f0f\u5706\u9525\u7684\u8868\u9762\u79ef\u516c\u5f0f\uff1a
\u9ad8\uff1a \uff08l\uff1a\u6bcd\u7ebf\u957f\uff0cr\uff1a\u5e95\u9762\u534a\u5f84\uff09
\u5e95\u9762\u5468\u957f\uff1a \uff08r\uff1a\u5e95\u9762\u534a\u5f84\uff0c \uff1a\u4fa7\u9762\u5c55\u5f00\u56fe\u5706\u5fc3\u89d2\u5f27\u5ea6\uff0cl\uff1a\u6bcd\u7ebf\u957f\uff09
\u5706\u9525\u7684\u8868\u9762\u79ef\u7531\u4fa7\u9762\u79ef\u548c\u5e95\u9762\u79ef\u4e24\u90e8\u5206\u7ec4\u6210\u3002\u5168\u9762\u79ef\uff08S\uff09=S\u4fa7+S\u5e95\uff1b
\u5176\u4e2d\uff0cS\u4fa7= \uff08r\uff1a\u5e95\u9762\u534a\u5f84\uff0cl\uff1a\u5706\u9525\u6bcd\u7ebf\uff0c \uff1a\u4fa7\u9762\u5c55\u5f00\u56fe\u5706\u5fc3\u89d2\u5f27\u5ea6\uff09
\u6269\u5c55\u8d44\u6599\uff1a
\u5706\u9525\u4f53\u5c55\u5f00\u56fe\u7531\u4e00\u4e2a\u6247\u5f62\uff08\u5706\u9525\u7684\u4fa7\u9762\uff09\u548c\u4e00\u4e2a\u5706\uff08\u5706\u9525\u7684\u5e95\u9762\uff09\u7ec4\u6210\u3002
\u5728\u7ed8\u5236\u6307\u5b9a\u5706\u9525\u7684\u5c55\u5f00\u56fe\u65f6\uff0c\u4e00\u822c\u77e5\u9053a\uff08\u6bcd\u7ebf\u957f\uff09\u548cd\uff08\u5e95\u9762\u76f4\u5f84\uff09
\u2235\u5f27AB=\u2299O\u7684\u5468\u957f
\u2234\u5f27AB=\u03c0d
\u2235\u5f27AB=2\u03c0a(\u22201/360\u00b0)
\u22342\u03c0a(\u22201/360\u00b0)=\u03c0d
\u22342a(\u22201/360\u00b0)=d
\u5c06a,d\u5e26\u51652a(\u22201/360\u00b0)=d\u5f97\u5230\u22201\u7684\u503c\u3002\u8fd9\u6837\u7ed8\u5236\u5c55\u5f00\u56fe\u7684\u6240\u6709\u6240\u9700\u6570\u636e\u90fd\u6c42\u51fa\u6765\u4e86\u3002\u6839\u636e\u6570\u636e\u5373\u53ef\u753b\u51fa\u5706\u9525\u7684\u5c55\u5f00\u56fe\u3002
\u6bcd\u7ebf\u957f\u7b49\u4e8e\u5e95\u9762\u5706\u76f4\u5f84\u7684\u5706\u9525\uff0c\u5c55\u5f00\u7684\u6247\u5f62\u5c31\u662f\u534a\u5706\u3002\u6240\u6709\u5706\u9525\u5c55\u5f00\u7684\u6247\u5f62\u89d2\u5ea6\u7b49\u4e8e\uff08\u5e95\u9762\u76f4\u5f84\u00f7\u6bcd\u7ebf\uff09\u00d7180\u5ea6\u3002
\u751f\u6d3b\u4e2d\u6c99\u5806\u3001\u6f0f\u6597\u3001\u5e3d\u5b50\u3001\u9640\u87ba\u3001\u6597\u7b20\u3001\u94c5\u7b14\u5934\u3001\u94bb\u5934\u3001\u94c5\u9524\u7b49\u90fd\u53ef\u4ee5\u8fd1\u4f3c\u5730\u770b\u4f5c\u5706\u9525\u3002\u5706\u9525\u5728\u65e5\u5e38\u751f\u6d3b\u4e2d\u4e5f\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1\u2014\u2014\u5706\u9525
\u5706\u67f1\u7684\u8868\u9762\u79ef\u600e\u4e48\u6c42
可得圆锥的高为4CM，圆锥的低圆的半径为4CM
套入圆锥的表面积公式就能求出来了！！！
不好意思，我把公式给忘了！！呵呵
20×3.14平方厘米
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