Two-dimensional (2D ... shapes and count the sides on each. Can you see both shapes have 6 sides, so both shapes are hexagons. What is different about the two shapes? All the sides on the first ...

2D shapes are flat, plane shapes. Triangles have three sides and three angles that add up to 180°. Quadrilaterals have four sides and four angles that add up to 360°. Constructing triangles ...