Mathematics 4024 · O Level · Non-right-angled triangles
Non-right-angled triangles — practice question
The diagram depicts a triangular field $ABC$. The lengths are $AB = 95\text{ m}$, $BC = 132\text{ m}$ and $AC = 174\text{ m}$.
(a)[3]
Show that $\angle BAC = 48.6^\circ$, accurate to $1$ decimal place.
(b)[4]
Flower seeds are used to sow the field. For every square metre, $3$ grams of seed are needed. The seed is priced at $\$8.50$ for $100$ grams. Calculate the cost of the flower seed needed for the field.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct cosine-rule form” …