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Acute Angle - GCSE Maths Definition

Reviewed by: Dan Finlay

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What is an acute angle?

In GCSE maths, an acute angle is an angle formed between two lines that is greater than 0° and less than 90°.

Diagram illustrating different types of angles: acute, right, obtuse, straight, and reflex, with definitions for each angle type.
Types of angles between two lines

An acute angle is smaller than a right angle. If two straight lines cross each other then there will be two pairs of equal angles. All four angles could be right angles; otherwise, one of the pairs will be acute angles.

Two intersecting lines cross an orange circle on the left and a green circle on the right. "Save My Exams" is written at the bottom.
Angles formed by two straight intersecting lines

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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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