GlossariesGCSE GlossariesGCSE Maths GlossarySemicircle

Semicircle - GCSE Maths Definition

Reviewed by: Dan Finlay

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A semicircle is half a circle. It consists of an arc of a circle (which will have a length that is half the circle's circumference) and a diameter of the circle that connects the ends of the arc. In solving problems involving perimeter, it is crucial to realise the diameter forms part of the perimeter of a semicircle. A standard 180° protractor is a semicircle.

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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.

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