Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this BBC Bitesize GCSE Maths Eduqas guide.

Classical trigonometry calls the separation between two lines an "angle", which is the length of a circular arc between two lines.

How do birds do trig? A bird migrates across thousands of miles of ocean. When we as humans interpret what they're doing, we have to interpret it in term of doing trigonometry.

Books Received Published: 29 June 1911 The Trisection of the Angle by Plane Geometry: Verified by Trigonometry with Concrete Examples G. B. M. Nature 86, 581–582 (1911) Cite this article ...

Learn and revise trigonometric ratios of sine, cosine and tangent and calculate angles and lengths in right-angled triangles with GCSE Bitesize AQA Maths.