Revise how to use the sine and cosine rules to find missing angles and sides of triangles as part of National 5 Maths.

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

The Book of Revelation tells us that the Number of the Beast, the Sign of the Devil, is 666. If you have a calculator handy enter 666 and hit the sine key (make sure you're in degree mode!).