Two intersecting circles with a triangle connecting them. Show that the three red points are collinear.

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## Solution

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- Post author By Marshall W. Buck
- Post date July 28, 2023
- 1 Comment on Angle chasing galore

Two intersecting circles with a triangle connecting them. Show that the three red points are collinear.

Scroll down for a solution to this problem.

Please find here the solution of the author.

## One reply on “Angle chasing galore”

The picture has mislead some viewers. The point where the orange and purple segments meet can be moved anywhere along the base of the blue triangle.

In particular, the line connecting the red dots is not in general parallel to the base of the blue triangle.