A 27 sided shape is called a Icosikaiheptagon.
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A trapezium is not a regular shape although it is a 4 sided quadrilateral.
Icosakaiheptagon :)
what do we call in the two sided fastener
you call a seven sided shape a heptagon.
It's acceptable to call it a27-agon but what's more important is knoing how to work out its properties