9
Part of 2007 AIME Problems
Problems(2)
Triangle and Tangent Circles
Source: AIME I 2007 #9
3/15/2007
In right triangle with right angle , and . Its legs and are extended beyond and . Points and lie in the exterior of the triangle and are the centers of two circles with equal radii. The circle with center is tangent to the hypotenuse and to the extension of leg CA, the circle with center is tangent to the hypotenuse and to the extension of leg CB, and the circles are externally tangent to each other. The length of the radius of either circle can be expressed as , where and are relatively prime positive integers. Find .
trigonometrygeometryrectanglegeometric transformationhomothetyUSAMTSnumber theory
Inscribed circles in rectangle
Source: AIME II 2007 #9
3/29/2007
Rectangle is given with and Points and lie on and respectively, such that The inscribed circle of triangle is tangent to at point and the inscribed circle of triangle is tangent to at point Find
geometryrectanglesymmetryAMCAIMEratiogeometric transformation