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.

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 a tool to make new sides. Dynamic geometry ...

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 ...

A 125-page proof posted to arXiv may represent a huge breakthrough in geometric measure theory.This problem has implications in fields like encryption, computer science, and number theory.How much ...

Two mathematicians now say they’ve made progress on a very old unsolved math problem. The problem involves a subfield called ...