GCSE Maths: Angles
Practise GCSE Maths angles — angles in triangles, polygons, parallel lines and circle theorems. Full AQA, Edexcel, OCR and Eduqas coverage.
GeometryFoundation & HigherAQA · Edexcel · OCR · Eduqas
What you need to know
The concepts examiners test on angles, and what each one is really asking.
Angles on a straight line and around a point
Angles in triangles and quadrilaterals
Interior and exterior angles of polygons
Angles in parallel lines (alternate, co-interior, corresponding)
Bearing problems
Where marks get lost
The exam technique that separates a correct method from a correct answer.
- Angles on a straight line = 180°
- Angles around a point = 360°
- Interior angle sum of n-sided polygon = (n−2) × 180°
Angles questions students ask
What are alternate angles?
Alternate angles are equal angles formed on opposite sides of a transversal crossing parallel lines — they form a "Z shape".
How do I find the interior angle of a regular polygon?
Interior angle = (n−2) × 180° ÷ n, where n is the number of sides.