Extangential quadrilaterals.

Carl Eberhart, carl.eberhart@g.uky.edu

This page has two sage interacts designed to investigate extangential quadrilaterals, quadrilaterals with a circle inscribed in the extended sides of the quadrilateral. See this paper (draft).

In order to begin, you first must click the top button to load the procedures needed. If things get messed up, you can always begin over by refreshing your browser and clicking the top button again.

To Begin, click this button first.

Extangential circles can also be obtained by choosing a radius rad in range .01 to 10, and angles $alpha$, $beta$, and $gamma$ with sum less than 180. If the quadrilateral is in the model it is black, otherwise it is red. Limits on the radius and angles are yet to be determined. Note the default values determine a quadrilateral which is approximately cyclic.