In the adjoining figure, $PT$ is a tangent to the circle with centre $C$. Given $CP=20 \mathrm{cm}$ and $PT=16$$\mathrm{cm},$ find the radius of the circle.

 

 

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle:

In the following figure, $O$ is the centre of the circle. Find the size of each lettered angle: