(a)[3]
Calculate angle $ADB$.
(b)[4]
Calculate $DC$.
(c)[3]
Calculate the shortest distance from $C$ to $BD$.
Mathematics 0580 · IGCSE · Non-right-angled triangles
Non-right-angled triangles — practice question
The diagram depicts quadrilateral $ABCD$, together with the lengths and angles that are given.
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This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “By the cosine rule, $\cos=\dfrac{8.6^2+9.7^2-4.4^2}{2\times8.6\times9.7}$” …
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