Sine Rule and Cosine Rule

Cosine Rule Pattern

The sine and cosine rule let you work out missing angles and side lengths of triangles which aren’t right-angled triangles. The trick to learning how to use these rules is to recognise the patterns that match triangles with the right rule. Is it a sandwich or an opposite?

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Quadratic Equations

Two, One or Zero Quadratic Solutions

Quadratic equations can be easier to solve if you know a few tricks. This shows you a few of those tricks, such as using the sign of the number term to quickly narrow down the possible solutions, and completing the square, but also explains why we bother to factorise quadratics in the first place.

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