(a)

In the diagram, the two circles intersect at X and Y. The centre of the smaller circle is on the circumference of the bigger circle. A and B are any two points on the major arcs, one on each circle. Find an equation connecting a and b.

(b)

In the diagram <QPR = <PTR = 90°, /PR/ = 8cm and /QP/ = 6cm. Find /TR/.