The erratic spider

A square with several line segments. Prove that the blue ones are parallel.

Scroll down for a solution to this problem.


Solution by Lewis Corner.


The erratic spider
A spider’s web dancing
In the morning dew
Near the window webbing a few
Silver threads like precious jewels
With some rain drops,
They just look at you
A spider’s web is hanging
Let’s hope nobody
Will come for cleaning


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