In a circle of diameter 20 cm, chords AB and CD are parallel to each other and lie on opposite sides of the centre. If BC is a diameter of the circle and chord AB is at a distance of 6 cm from the centre, what is the length (in cm) of chord CD?

If B is the center of a circle and lines AD and CD are tangent segments drawn from an external point D, then which of the following classifications apply to quadrilateral ABCD? (a) Kite (b) Cyclic quadrilateral (c) Rhombus (d) Trapezium

In a parallelogram PQRS, rays PA and SA are the angle bisectors of ∠QPS and ∠RSP respectively. Find the measure of ∠PAS.