Otro
A collinearity involving an excircle, the incircle, and the circumcircle
Autor
Warendorff, Jay
Resumen
Let ABC be a triangle with incenter I and circumcircle Q. Let J be the excenter of the excircle opposite A. Let IJ intersect BC at D and let IJ intersect Q at M. Let N be the midpoint of arc MBA of Q. Let S and T be the second intersection points of NI, NJ with Q. Then S, D, T are collinear Componente Curricular::Ensino Médio::Matemática