MathDB
Circles inside a rectangle

Source: Cono Sur Olympiad, 1995, Problem 3

May 28, 2006
geometryrectanglequadraticsalgebracono sur

Problem Statement

Let ABCDABCD be a rectangle with: AB=aAB=a, BC=bBC=b. Inside the rectangle we have to exteriorly tangents circles such that one is tangent to the sides ABAB and ADAD,the other is tangent to the sides CBCB and CDCD. 1. Find the distance between the centers of the circles(using aa and bb). 2. When the radiums of both circles change the tangency point between both of them changes, and describes a locus. Find that locus.