In figure, O is the centre of the circle of radius 10 cm. OQ WZ, OP XY, XY || WZ, WZ = 16 cm and XY = 12 cm. then length of PQ is:
2 cm
4 cm
1 cm
3 cm
Find the radius of the circle with centre O. PT is a tangent and AB is perpendicular to PT. PA and PB is 4 cm and 2 cm respectively.