Mathematics 0580 · IGCSE · Non-right-angled triangles

Non-right-angled triangles — practice question

A triangle is drawn, and it is NOT TO SCALE. The side lengths are marked 8 cm and 12 cm, and one angle measures $39^{\circ}$. The obtuse angle is labelled $x$.
(main)[3]

Calculate the obtuse angle $x$ for this triangle.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\frac{12\sin39}{8}$” …

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