Theorems about quadrilaterals and conics

Đorđe Baralić, Branko Grbić, Đorđe Žikelić
2013 International Journal of Computer Mathematics  
We study quadrilaterals inscribed and circumscribed about conics and prove interesting theorems. Theorems are discovered by experimenting with dynamical geometry software. The Poncelet theorem for quadrilaterals is proved by elementary means together with Poncelet's grid property.
doi:10.1080/00207160.2013.844338 fatcat:riy2yoxnsvgrtdphid5waafs4m