Mathematics 4024 · O Level · Circle theorems I

Circle theorems I — practice question

$A$, $B$, $C$ and $D$ lie on a circle with centre $O$. Angle $BAD = 120^{\circ}$ and angle $OBC = 20^{\circ}$.

(a)[2]

Find what $x$ is equal to.

(b)[2]

Find what $y$ is equal to.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Thus, $x=40$.” …