1

In the diagram, $A$, $B$ and $C$ are points on a circle, centre $O$. Angle $ACB = 55^\circ$. Work out the size of angle $x$. [2]

2

$A$, $B$ and $C$ are points on a circle and $AB$ is a diameter. Angle CAB $= 34^\circ$. Work out the size of angle CBA, marked $x$. [2]

3

$A$, $B$, $C$ and $D$ are points on a circle. Angle $ACB = 29^\circ$. Work out the size of angle $ADB$, marked $x$. [2]

4

$A$, $B$, $C$ and $D$ are points on a circle, forming a cyclic quadrilateral $ABCD$. Angle ABC $= 82^\circ$. Work out the size of angle CDA, marked $x$. [2]