A geometry problem over a century old has just found its definitive answer. Mathematicians have confirmed that the solution ...

Explore five-, four- and three-sided polygons. Find out how they can change if their sides stay the same length. Create new shapes that always have the same side lengths. Experiment with the circle as ...

Polygons are multi-sided shapes with different properties ... Circle theorems are used in geometric proofs and to calculate angles. Transformations - Edexcel Transformations change the size ...

Before reading this guide, it may be helpful to read the guides from Module 1 on the properties of angles and the properties of 2D shapes. The sum of the angles inside any polygon can be found by ...