The radii of two concentric circles are x cm and 26 cm. P and S are points on the larger circle, and Q and R are points on the smaller circle. If PQRS is a straight line, QR = 40 cm, and PS = 48 cm, then what is the value of x? (where x < 26 cm)

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.