We recognise 2D shapes (flat) and 3D shapes (solid).
Flat (2D) shapes
A square has 4 equal sides and 4 corners; a triangle has 3 sides; a rectangle has 4 sides; a circle is round with no corners.
Solid (3D) shapes
Some solid shapes are the cube, sphere (ball), cylinder and cone.
Remember
- Square & rectangle: 4 sides · Triangle: 3 sides · Circle: no corners.
- 2D shapes are flat; 3D shapes are solid.