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.