one circle and one quadrilateral PART1Ā@Ā@
Quadrilateral ABCD contacts circle O.
What the geometric quality is there among the length of Quadrilateral ABCD , the are of Quadrilateral ABCD , the radius of Circle O ?
Ā@You can also move point A,C,O on CABRI
Download CABRIáU data (d67) from here.