怎样画已知直线的垂线 经过直线上一点画已知直线的垂线？（怎么画？）
\u5982\u4f55\u8fc7\u4e00\u70b9\u753b\u51fa\u5df2\u77e5\u76f4\u7ebf\u7684\u5782\u7ebf.\u4e00\u5bf9\u9f50\uff0c\u4e8c\u5361\u7d27\uff0c\u4e09\u753b\u7ebf\u3002
\u5c31\u662f\u7528\u4e00\u6761\u8fb9\u548c\u4e00\u4e2a\u70b9\u753b\u4e00\u4e2a\u76f4\u63a5\u4e09\u89d2\u5f62\uff0890\u00b0\uff09\uff0c\u4e0d\u61c2\u518d\u95ee\u3002
\u505a\u4efb\u52a1\u5462\uff0c\u5e0c\u671b\u7ed9\u4e2a\u91c7\u7eb3
1\u3001\u5c3a\u89c4\u4f5c\u56fe
\u4ee5\u5df2\u77e5\u70b9O\u4e3a\u4e2d\u5fc3\uff0c\u53d6\u76f4\u7ebf\u4e0a\u7684\u4e24\u70b9A\uff0cB\uff0cAO=BO\u3002\u4ee5AB\u4e24\u70b9\u4f4d\u5706\u5fc3\uff0c\u76f8\u540c\u534a\u5f84\uff0c\u534a\u5f84\u957f\u5ea6\u5927\u4e8eAO\uff0c\u505a\u5706\uff0c\u4e24\u5706\u4ea4\u4e8eC\u70b9\uff0c\u8fde\u63a5CO\uff0cCO\u5782\u76f4\u4e8e\u76f4\u7ebf\u3002
2\u3001\u76f4\u5c3a\u4f5c\u56fe
\u5df2\u77e5\u76f4\u7ebfm\u548c\u76f4\u7ebfm\u5916\u4e00\u70b9A\uff0c\u8fc7\u70b9A\u753b\u76f4\u7ebfm\u7684\u5782\u7ebf\uff0c\u4e0b\u56fe\u4e2da\u5c31\u662f\u6240\u6c42\u7684\u76f4\u7ebf\u3002
\u628a\u76f4\u5c3a\u7684\u76f4\u89d2\u8fb9\u6cbf\u7740\u76f4\u7ebf\u5e73\u79fb\uff0c\u5f53\u76f4\u89d2\u70b9\u548c\u5df2\u77e5\u70b9\u91cd\u5408\uff0c\u8fc7\u4ee5\u77e5\u70b9\u6cbf\u7740\u53e6\u4e00\u6761\u76f4\u89d2\u8fb9\u505a\u76f4\u7ebf\uff0c\u753b\u51fa\u7684\u76f4\u7ebf\u5782\u76f4\u4e8e\u5df2\u77e5\u76f4\u7ebf\u3002
\u6269\u5c55\u8d44\u6599
\u5c3a\u89c4\u4f5c\u56fe\u57fa\u672c\u65b9\u6cd5\uff1a
1\u3001\u901a\u8fc7\u4e24\u4e2a\u5df2\u77e5\u70b9\u53ef\u4f5c\u4e00\u76f4\u7ebf\u3002
2\u3001\u5df2\u77e5\u5706\u5fc3\u548c\u534a\u5f84\u53ef\u4f5c\u4e00\u4e2a\u5706\u3002
3\u3001\u82e5\u4e24\u5df2\u77e5\u76f4\u7ebf\u76f8\u4ea4\uff0c\u53ef\u6c42\u5176\u4ea4\u70b9\u3002
4\u3001\u82e5\u5df2\u77e5\u76f4\u7ebf\u548c\u4e00\u5df2\u77e5\u5706\u76f8\u4ea4\uff0c\u53ef\u6c42\u5176\u4ea4\u70b9\u3002
5\u3001\u82e5\u4e24\u5df2\u77e5\u5706\u76f8\u4ea4\uff0c\u53ef\u6c42\u5176\u4ea4\u70b9\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1\u2014\u5c3a\u89c4\u4f5c\u56fe
作法步骤一：以C点为圆心，任意长为半径画弧，交AC于E点，交BC于F点，如图所示
作法步骤二：以E,F为圆心，大于1/2长为半径画弧，两弧交于D点，如图所示
作法步骤三：连接CD，如图所示
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