QUADRILATERAL its spelled correctly so dont worry about that.
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piecedecagon
It's a pentagon...
In geometry, a tridecagon (or triskaidecagon) is a 13-sided (and angled) polygon.
In Geometry a 15 sided shape is called a pendedecagon polygon with 15 angles and sides
In Geometry a 15 sided shape is called a pendedecagon polygon with 15 angles and sides