(a)[4]
Calculate the length of $BC$.
(b)[3]
Calculate the obtuse value of angle $ADC$.
(c)[4]
Find what percentage of triangle $ABC$ is shaded.
Mathematics 4024 · O Level · Non-right-angled triangles
Non-right-angled triangles — practice question
The diagram shows $AB=8\text{ cm}$, $AC=11\text{ cm}$ and $DC=6.5\text{ cm}$. Also, $\angle B\hat{A}D=26^\circ$ and $\angle D\hat{A}C=30^\circ$.