The Cosine Rule
This section finds a missing side or a missing angle in any triangle with the cosine rule: (and cyclic). Use two sides and the included angle (SAS) to find the third side, or…
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What will I learn in "The Cosine Rule"?
This section covers The Cosine Rule as part of Trigonometry: Sine, Cosine and Area Rules in Grade 12 Mathematics. You'll find clear explanations, worked examples, and key definitions aligned to the CAPS curriculum.
Is this section aligned with the CAPS curriculum?
Yes. All notes on Hlayiso, including "The Cosine Rule", are written against the official CAPS curriculum and ATP for Grade 12 Mathematics.
What should I study after "The Cosine Rule"?
Continue with the next section in Trigonometry: Sine, Cosine and Area Rules, or test your understanding with the interactive quiz linked to this section.
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