Draw a circle with any radius and then draw two chords equidistant from the centre.

Name the following parts from the adjacent figure where $\text{'}O\text{'}$ is the centre of the circle.

$\overline{AB}$

Name the following part from the below figure where $\text{'}O\text{'}$ is the centre of the circle.

$\widehat{BC}$

Name the following part from the below figure where $\text{'}O\text{'}$ is the centre of the circle.

$\overline{AC}$

Name the following part from the below figure where $\text{'}O\text{'}$ is the centre of the circle.

$\widehat{DCB}$

Name the following parts from the adjacent figure where $\text{'}O\text{'}$ is the centre of the circle.

$\widehat{ACB}$

Find the values of $x$ and $y$ in the figure given below.

Prove that a cyclic rhombus is a square.

Draw a circle and inscribe the trapezium. If a polygon of the given type can't be inscribed, write not possible.