Mathematics 4024 · O Level · Right-angled triangles
Right-angled triangles — practice question
The figure depicts a vertical wind turbine whose blades measure 30 m in length.
(a)[3]
Calculate the length of $AB$.
(b)[4]
Calculate the angle of depression from $F$ to $E$.
(c(i))[1]
Calculate the distance travelled by $P$ after one complete revolution of the blade.
(c(ii))[2]
Calculate the speed of $P$ and express your answer in kilometres per hour.
(c(iii))[2]
Calculate $PQ$.
Worked solution & mark scheme
This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Set up the sine-rule relation as $\dfrac{AB}{\sin115}=\dfrac{30}{\sin9}$” …