Find out about regular 2d shapes and irregular polygons. What are the types of triangle? Find out about scalene, equilateral, isosceles and right-angled triangles. What are the parts of a circle?

These guys are 2D shapes and 2D shapes are everywhere ... Postcards. Pentagons, 5 sides. You can see these in the black shapes in the patterns on a football. Hexagons, 6 sides.