Two intersecting circles and a common tangent. The two tangency points are shown in black. Prove that the three red points are collinear.
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Solution

Two intersecting circles and a common tangent. The two tangency points are shown in black. Prove that the three red points are collinear.
Scroll down for a solution to this problem.
Two intersecting circles and a common tangent. The two tangency points are shown in black. Prove that the three red points are collinear. https://t.co/H8lXABicAl Inspired by Di Pasquale ea. pic.twitter.com/cRFN3fotJ1
— Mirangu (@Mirangu1) February 2, 2023