MathDB
concurrency wanted. 3 circles intersecting in pairs given (Chile 1997 P5)

Source:

May 27, 2019
geometrycirclesconcurrent

Problem Statement

Let: C1,C2,C3 C_1, C_2, C_3 three circles , intersecting in pairs, such that the secant line common to two of them (any) passes through the center of the third. Prove that the three lines thus defined are concurrent.