Uneven cups

Two semicircles and several line segments. Prove that the red line segments are parallel.

Scroll down for a solution to this problem.


Solution by Nèstor Abad.


Cups with balls
That gets out of hand
A pirouette
For holidays
New year soon
And the ritual
Every year renewed
To please oneself
Love and laughter
And answer
To desires
The cups dance
With elegance
Happy they think
At their coffee
Well prepared


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