Angle Formulas in Trigonometry: Definition, Representaion, Questions & More Check definition and formulas for central angle, double angle and multiple angles.

I'm talking about trigonometry, of course: that bastion of angles and triangles that is essential to calculating velocity, momentum, and much more.

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

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

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