Trigonometry 1

3 fact triangles – PDF – Given four facts about a triangle, only three of which are true at any one time, how many triangles can you make? Teacher notes.

Common ratios and radians – Powerpoint – Deriving common trig ratios and converting between degrees and radians.

The videos below are by ExamSolutions. Visit his website here for more videos.

Trig ratios
Sine and cosine rule
Arcs, sectors and segments

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