By 2-D shapes
Circle attributes sides: vertices: What is special about a circle:
Triangle attributes sides: vertices: What is special about a triangle:
Square attributes sides: vertices: What is special about a square:
Rectangle attributes sides: vertices: What is special about a rectangle:
Rhombus attributes sides: vertices: What is special about a rhombus:
Trapezoid attributes sides: vertices: What is special about a trapezoid:
Pentagon attributes sides: vertices: What is special about a pentagon:
Hexagon attributes sides: vertices: What is special about a hexagon:
Octagon attributes sides: vertices: What is special about a octagon: