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两个半径相等的圆相交,有如下的一个特点:如图1,两个半径相等的圆相交于A、B两点.则圆O_1上过B点的切线与圆O_2上过A点的切线平行.
Two circles with the same radius intersect with each other, as shown in Fig. 1. Two circles with the same radius intersect at two points A and B. Then the tangent line of point O_1 over point B and the tangent line of circle O_2 over point A. parallel.