Pentadecagon or pentakaidecagon are accepted, though 15-gon is as well.
multi sided shapes are called polygons
Equal sided = equilateral.
Hexagons.
Heptagon.
hexagon.
Hexagon
Polygons.
pentagons
3d shapes with six faces are called hexahedra.
They are called Quadrilaterals.
No because all 4 sided shapes are called quadrilaterals which includes parallelograms
Quadrilaterals