In the figure, $\mathrm{\angle }OMA\backslash angle\; OMA$ =

Number of points required to describe a circle is

Number of circles that can be drawn through a given point is

Number of circles that can be drawn through two different points is

Number of circles that can be drawn through three non-collinear points is

In the figure, $\mathrm{\angle }ADB\backslash angle\; ADB$ =

In the figure, $\mathrm{\angle }ABC\backslash angle\; ABC$ is

If a parallelogram is cyclic then it is a

Angle subtended by an arc at its centre is ${}^{\mathrm{\prime }}{\text{x}}^{\circ }{}^{\mathrm{\prime }}\text{'}\backslash text\{x\}^\backslash circ\{\text{'}\}$ then, angle subtended by it at any other point on the circle is

The perpendicular from the centre of a circle to a chord