(a)[2]
Calculate the area of triangle $ABC$.
(b)[2]
Work out the value of $x$.
Mathematics 0580 · IGCSE · Non-right-angled triangles
Non-right-angled triangles — practice question
For part (a), triangle ABC has sides AB = 6.2 cm and BC = 4.7 cm, with angle ABC = 82^{\circ}. The diagram is NOT TO SCALE.
For part (b), triangle DEF has sides DE = 107 mm and DF = 75 mm, and the angle at D is marked $x^\circ$. The area of triangle DEF is 2050 mm$^2$. The diagram is 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: “Using the relevant formula gives $\frac{1}{2} \times 6.2 \times 4.7 \times \sin 82$.” …
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