Here's a question I am unable to solve because I don't know what a tangent is :P
Q. Two circles of radii x and y touch each other externally ( x > y ). If AB is the common tangent then (AB)^2 is equal to _________.
(a) 4xy (b) (x-y)^2 (c) (x + y) (d) (x + y)^2
Please Answer..
