Q1.O is the center of 2 concentric circles of radii 4cm and 6cm resp. PA &PB are tangents to the outer and inner circle resp. if PA=10cm , find the length of PB upto one place of decimal . Q2. PQ is a chord length 8cm of a circle of radius 5cm. The tangents at P&Q INTERSECT at a point T . Find the length TP.