GlossariesGCSE GlossariesGCSE Maths GlossaryRadius

Radius - GCSE Maths Definition

Reviewed by: Dan Finlay

Published

In GCSE Mathematics, radius is the term used to describe the (straight-line) distance between the centre of a circle and its circumference. The radius is half the diameter. The radius, often abbreviated to just r, is used in many problems involving circles, such as finding the area of the circle, and area of sectors and segments.

Examiner-written GCSE Maths revision resources that improve your grades 2x

  • Written by expert teachers and examiners
  • Aligned to exam specifications
  • Everything you need to know, and nothing you don’t
GCSE Maths revision resources

Share this article

Dan Finlay

Reviewer: Dan Finlay

Expertise: Maths Subject Lead

Dan graduated from the University of Oxford with a First class degree in mathematics. As well as teaching maths for over 8 years, Dan has marked a range of exams for Edexcel, tutored students and taught A Level Accounting. Dan has a keen interest in statistics and probability and their real-life applications.

The examiner written revision resources that improve your grades 2x.

Join now