Draw a circle of radius $6 \mathrm{cm}$ using ruler and compasses. Draw one of its diameters. Draw the perpendicular bisector of this diameter. Does this perpendicular bisector contain another diameter of the circle?

Draw a circle touching three non-collinear points.

Draw a circle of radius $4.2 \mathrm{cm}$ with the centre at $O$. Mark three points $A, B,$ and $C,$ such that point $A$ is on the circle, $B$ is in the interior, and $C$ is in the exterior of the circle.

Draw two circles of the same radii. $A$ is the centre of one circle and $B$ is the centre of the other circle. Draw one of the circles in such a way that it passes through the centre of the other.

Draw a circle of radius $4 \mathrm{cm}$ with the centre at $O$. Mark three points $A, B,$ and $C,$ such that point $A$ is on the circumference, $B$ is in the interior, and $C$ is in the exterior of the circle.