A cover with strangely shaped stamp issued in 2010 regarding the European Figure Skating Championship in Tallin. Received via one of those philatelic chain letters :)
Ehm, I had to look up the shape...it is one of the cyclic quadrilaterals.
Ehm, I had to look up the shape...it is one of the cyclic quadrilaterals.
That is a shape name I never knew the name, or indeed if it had one.
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