Michael Diao and Andrew Wu,
The Radical Axis of the Circumcircle and Incircle of a Bicentric Quadrilateral,
Forum Geometricorum, 19 (2019)
Abstract: We present an unusual method to identify the radical axis of the circumcircle and incircle of a bicentric quadrilateral. Along the way, we demonstrate
a number of interesting properties of the configuration.
[ps file] [ ]