Question 19
In the circle with centre $O$, $\angle AOB=120^\circ$ and $\angle BOC=72^\circ$, as shown. Point $E$ is on the circle with $OE\perp AC$. Find $\angle OBE$.
Use the position of E shown in the source figure: E is on the minor arc AC not containing B.
Original source figure, with all mathematical labels retained.
Use the position of E shown in the source figure: E is on the minor arc AC not containing B.
Original source figure, with all mathematical labels retained.