This book provides a refresher for basic trigonometry. It covers: basic use of Sine, Cosine and Tangent to find sides or angles of right-angled triangles; Derivation and examples of the Sine Rule, Cosine Rule and Area of a triangle. It is suitable as a revision aid for anyone studying basic trigonometry but is particularly helpful for the Scottish SQA courses listed below: CFE maths outcomes MTH 4-16a National 4 Relationships 1.3 National 5 Applications 1.1.