Where in the plane is Cartesian SanDodecagon?

Where in the plane is Cartesian SanDodecagon?

This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
(may not load correctly).
Someone has stolen Euclid's axioms from Fort Knonagon!

It's up to you to solve the case and catch the culprit, gumshoe.
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