Radius and Diameter GCSE Maths
Radius and diameter are essential circle words. Understanding them helps with area, circumference, sectors, and arc length questions.
Definitions
- The radius is the distance from the centre to the edge.
- The diameter is the distance across the circle through the centre.
- The diameter is twice the radius.
- The radius is half the diameter.
Exam tip: Before using a circle formula, check whether the question gives radius or diameter.
Common mistake: Students often forget to halve the diameter before calculating area.
Video explanation
A short Worthing Maths Tutor video explanation for Radius and diameter GCSE Maths can be embedded here later to improve student engagement and time on page.
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