PDA

View Full Version : A Tangent related question..


iLuvReading
Nov 23, 2013, 09:00 PM
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..

Scleros
Nov 24, 2013, 01:47 AM
See Wikipedia: Tangent (https://en.wikipedia.org/wiki/Tangent).