Bisect 7 circles

As shown in the figure,  7 equal circles touch each other . Draw a line to bisect the areas of these circles.

Write down your proof by means of congruent triangles.

Sooner or later you will find out more than one possible line to bisect the areas of these circles.

How many possible lines are there?

Answer

 This page was first created by Mr. Francis Hung on 15^th January, 2011. Last updated: 20230630.