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. Parts of a circle Discover the ...

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 ...