Named for Plato, who theorized that the classical elements were made of these regular polyhedrons, three of the Platonic solids are composed of equilateral triangles: the tetrahedron, octahedron ...

Explore the triangle area formula, its derivation, and practical examples to master this essential geometric concept effortlessly.

Triangles examples: differing orientations and sizes 4. Together decide whether or not the shapes are triangles and drag examples and non-examples to separate parts of the screen. Have students create ...

Arrange them in an equilateral triangle with one coin at the top, two coins touching below, three coins below that, then four, then five.

There are lots of different types of polygon. Find out about quadrilaterals, triangles, polygons and circles in this KS2 Maths guide from BBC Bitesize.