A cricket ground is in the shape of a quadrilateral. If a batsman hits a four, then the ball has to touch a point

What shape is a full moon?

What shape are the wheels of the scooter?

In the adjoining figure, by using centre $O$, write three radii.

In the adjoining figure, by using centre $O$, write three chords.

In the adjoining figure, by using centre $O$, name a diameter.

In the adjoining figure, by using centre $O$, name a triangle that has the centre of the circle as a vertex.

In the adjoining figure, $O$ is the centre of the circle. $OL$ is a _____ of the circle.

In the adjoining figure, $O$ is the centre of the circle. $AB$ is a _____ of the circle.