How about a triangle which is a 2 dimensional shape with 3 sides
a square...it's a cube that is 3-d square
I cannot think of any 2-d shape. The 3-d shape with four faces is a tetrahedron.
A quadrilateral is a 2D shape that has 4 sides
-3
-3
A 2-D shape with seven sides is called a HEPTAGON.
A dodecagon has 12 sides.
a face
-2
its not uniform and depending on how detailed you get it will have different amounts of sides also if you are counting it as 3-d or 2-d will change the answer so really the best answer is 3-d polyhedron 2-d polygon
A square
Hexagon