如何用三种方式画互相垂直的直线 画两组互相垂直的直线，怎么画呀
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2、选取一条直线，以直线上两个不同的点为圆心作圆，使得两个圆有两个交点，连接这两个交点，这条连接后线段与开始的那条直线垂直
3、以同一点O为圆心，作两个半径分别为3、5的圆，在内圆上任意选取一点A，作半径为4的圆，交外圆于B、C，连接OB、OC，那么OA垂直于AB，OA垂直于AC
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