
Definition: A quadrilateral is cyclic if it can be inscribed in a circle. 
You can move the vertices of the given cyclic quadrilateral with pressed mouse button.
Opposite angles in a cyclic quadrilateral add up to 180°. 
Mathematics Applets (Overview) 
URL: http://www.walterfendt.de/m11e/cyclquadrilat.htm
© Walter Fendt, November 1, 1997
Last modification: January 16, 2003