In the diagram, $BCF$ and $BAE$ are the tangents to the circle at $C$ and $A$ respectively. $AD$ is a diameter and angle $ABC=40°$. Calculate the value of $\angle CAB$.

In the diagram, $BCF$ and $BAE$ are the tangents to the circle at $C$ and $A$ respectively. $AD$ is a diameter and angle $ABC=40°$. Calculate the value of $\angle DAC$.

In the diagram, $BCF$ and $BAE$ are the tangents to the circle at $C$ and $A$ respectively. $AD$ is a diameter and angle $ABC=40°$. If $\angle ADC=k°$, then find the value of $k$.

Find the size of lettered angles in the figure. $O$ is the centre of the circle.

Find the size of lettered angle in the figure. $O$ is the centre of the circle.

Find the size of lettered angles in the figure.

Find the size of lettered angles in the figure.

Find the size of lettered angle in the figure.

Find the size of lettered angle in the figure.