**Diameter AB of a circle with centre O is produced to a point P such that PO = 16.8 cm. PQR is a secant which intersects the circle at Q and R, such that PQ = 12 cm and PR = 19.2 cm.The length of AB (in cm.) is :** A) 15.8 B) 14.4 C) 15.2 D) 14.2 Click Link for Answer