Points $A$, $B$ and $C$ lie on a circle with centre $O$. $\angle ACB=40^\circ$. Calculate

Question

Points $A$, $B$ and $C$ lie on a circle with centre $O$. $\angle ACB=40^\circ$. Calculate $\angle AOB$.

Accepted Answer

$80^\circ$.

Sec 3/4 E Math Mock 1-Q15 - Mock Paper 1: Angle at the centre of a circle