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

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

The mathematical study of triangles has just got a whole lot simpler, according to a researcher who says his new theory of trigonometry is easier to use and more accurate. Associate Professor ...

The mathematical study of triangles has just got a whole lot simpler, according to a researcher who says his new theory of trigonometry is easier to use and more accurate. Associate Professor ...

Use This Simple Trick to Measure an Angle Using Only a Level It's all about the plumb.

Two New Orleans high school students have proven the Pythagorean Theorem using trigonometry without relying on circular reasoning. That should be impossible.