The longest chord of a circle is equal to its

An arc is a continuous part of the _____ of the circle.

The centre of the circle always lies in the interior of the

From the given figure, write a pair of parallel line segments?

The point of intersection of the line segments $AB$ and $BC$ is _____.

The common arm of $\angle 1$ and $\angle 2$ is _____.

_____ is the diagonal of quadrilateral $ABCD$.

In the adjoining figure, $O$ is the centre of the two circles, identify the radii of the inner circle?

In the adjoining figure, $O$ is the centre of the two circles, then the two circles are called _____ circles.