Apply what you have learned about circle properties to calculate the diameter of circle, if $AB=CD=11.4 \mathrm{cm}, OF=6.5 \mathrm{cm}$. Give approximate answer to $3$ significant figures.

    

Apply what you have learned about circle properties to calculate the diameter of circle, if $AB=2.8 \mathrm{cm}$. Give approximate answers to $3$ significant figures.

A circle with a radius of $8.4 \mathrm{cm}$ has a chord $5 \mathrm{cm}$ from its centre. Calculate the length of the chord (in $\mathrm{cm}$) correct to $2$ decimal places.

ln this diagram, find the length of $AO$ and the area of quadrilateral $AOCB$. $BA$ and $BC$ are tangents to the circle.

In the diagram, $AB$ and $AD$ are tangents to the circle. $ABC$ is a straight line. Calculate the size of angle $x$.

Calculate the size of the lettered angles in the diagram.

Calculate the size of the lettered angles in the diagram.

Calculate the size of the lettered angle in the diagram.

Calculate the size of the lettered angle in the diagram.