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Calculate the angle $LMN$.
Mathematics 0580 · IGCSE · Non-right-angled triangles
Non-right-angled triangles — practice question
A triangle $LMN$ is drawn. The lengths are $LN = 14\text{ cm}$, $NM = 16\text{ cm}$ and $LM = 19\text{ cm}$. The figure is labelled NOT TO SCALE.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The cosine-rule formula is $\cos M=\frac{16^{2}+19^{2}-14^{2}}{2\times16\times19}$” …
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