Monash University researchers have extended Descartes’ Circle Theorem by finding a general equation for any number of tangent ...

The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown.

According to current theories of expertise, this shouldn’t happen. Becoming an expert in chess, for example, makes you better ...

Circle theorems are used in geometric proofs and to calculate angles. Transformations - Edexcel Transformations change the size or position of shapes. Congruent shapes are identical, but may be ...

Create new shapes that always have the same side lengths. Experiment with the circle as a tool to make new sides. Dynamic geometry software (DGS) is a powerful tool for improving student learning.