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Find $x$, if $O$ is the centre of the circle.

Find $x$ and $y$ if $O$ is the centre of the circle.

Find $x$ and $y$ if $O$ is the centre of the circle.

Find $x$ and $y$ if $O$ is the centre of the circle.

Find $x, y$ and $z$ in the following figure.

Find $x, y$ and $z$ in the following figure.

Draw a circle with centre $O$ and diameter $AB=26 \mathrm{cm}$. $AC$ and $BC$ are two chords of the circle, $BC=10 \mathrm{cm}$, $OD$ is a perpendicular to the chord $BC$ and $OD=8 \mathrm{cm}$. Verify whether the following statement is true or not: $AC=2OD$

In the adjoining figure, find the value of $\angle OBC$ if $\angle AOC=52°$, where $O$ is the centre of the circle.