What is the number of lines of symmetry for a parallelogram?

Choose the image of the given figure with respect to the given line from the given options,

In the given figure, $PQ$ and $RS$ are chords of length $10$ cm each intersecting at $B.$ If $\angle PBS=90°$ and the area of $△PBS$ is $32 {\text{cm}}^2$, then the length of $BR$ is _____.

In the above figure (not to scale), $O$ is the centre of the circle $\overline{BC}$ and $\overline{CD}$ are equal chords. If $\angle OBC=70°,$ then find $\angle BAD.$

In the above figure (not to scale), $O$ is the centre of the circle. $\overline{AP}$ and $\overline{BP}$ are two chords. $C$ is the point of intersection of $\overline{AP}$ and $\overline{OB}$. If $\angle OAC=30° \text{and} \angle PBC=80°,$ then $\angle AOB=$_____.

In the above figure, $\overline{AB}$ and $\overline{AC}$ are equal chords and $\overline{OD}$ is perpendicular to $\overline{AC}$. If $\angle COD=60°,$ then the angle between the chords is _____.

In the above figure, $O$ is the centre of the circle and $AB=CD$. If$\angle APB=110°,$ then find the angle made by the chord $CD$ at the centre.

In the above diagram (not to scale), $AB=AC.$ $O$ is the centre of the circle. If $\angle ABC=80°$, then $\angle BOC=$_____.

In the figure above (not to scale), $AB=CD$ and $\angle A=100°.$ Then $\angle C=$_____.