Two tangent circles, a common tangent and a perpendicular line segment inside a triangle. Prove that the three green points are collinear.
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Solution

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Poem
Cherries in a can
Having fun
They roll
They caresses eachother
They are preparing
The box in their showcase
Who protects them
In their sirup
It’s the essence of pleasure
Each cherry is very red
Each one is a marvel
