一、圈内两对三角形的相关定义定义1：三角形三个内角平分线的延长线与其外接圆相交,交点构成的三角形叫做原三角形的角线三角形．定义2：三角形三条边上高线或其延长线与其外接圆相交,交点所构成的三角形叫做原三角形的高线三角形． 1. Definitions of two pairs of triangles in a circle Definition 1: The extension of the three internal angle bisectors of a triangle intersects with its circumscribed circle. The triangle formed by the intersection points is called the triangle of the original triangle. Definition 2: The triangles on the three sides of the triangle intersect with their circumscribed lines or their extensions. The triangle formed by the intersections is called the triangle of the original triangle.