Triangles
2d shapes that do not have equal sides do not usually have special names.
rectangle
the answer is 8
Hectogon
A septagon or a heptagon
isoceles triandle, square
2D - Nonagon 3D - Nonahedron
Square and rhombus.
No
Squares
A triangle as no other 2d shape can have 3 sides.
in 2d shapes a quadrilateral