Key concepts: Use the sine, cosine and tangent ratios to solve to solve problems involving right-angled triangles. While the equations can be solved by other methods, NumSolve is encouraged here and an extension is to save the formulae in an eActivity. This is a particularly useful approach where students are finding the algebraic methods for solving the equations taking up a lot of time. Apps: NumSolve, eActivity Activity Solution

Key concepts: Draw scale diagrams to solve problems involving right-angled triangles. This technique is useful whenever a scale diagram can be used to solve the problem. Apps: Geometry Activity Solution