Find the radius of the circle with diameter $18 \mathrm{cm}$.

Name the centre point of the circle.

Name the diameter of the circle.

Name the chord of the circle.

Name the radius of a circle.

Name $\mathrm{OQ}$ in the circle. 

Name $\mathrm{OP}$ in the circle.

Write down the radius of the following.

$34 \mathrm{cm}$ diameter