Shapes with straight sides are called polygons
They are called heptagons.
They are called hendecagons.
Nonagons.
Hexagon.
a triangle
There is no special name that distinguishes shapes with more than four sides from shapes with four or fewer.
A quadrilateral.
quadrangles No it quadrilaterals
They are called Enneahedrons or nonahedrons.
They are called Quadrilaterals. The 'Quad' means 4
Names for shapes that have equal sides are called EQUILATERAL.