Cheatsheet · Grade 11 · 2 pages · PDF
The Sine & Cosine RulesCheatsheet
The whole topic on a page or two, for the night before.
A complete 22-page IGCSE guide to solving non-right-angled triangles. It starts with standard triangle labelling, then teaches the sine rule for finding sides and angles, including a full explanation of the ambiguous case. It also covers the cosine rule for finding a side from two sides and the included angle, or an angle from all three sides, and the area formula ½ab sin C. A decision table shows exactly which rule to use. The final section works through a multi-step quadrilateral problem that combines all three tools. Every method comes with clear diagrams and step-by-step worked examples. It ends with a summary, a keyword guide and exam tips.
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The full notes: one idea per page, a worked example beside every rule.
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Practice questions in the order the notes teach them.
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