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 Learn how ...

Two-dimensional (2D) shapes are completely flat. They cannot be picked up. A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they ...

Shapes are great fun. We see them everywhere! See if you can spot shapes in the objects around you. Can you see any 2-D shapes such as squares, rectangles, triangles, circles, semicircles, ovals? For ...