Special Cases
Any square, rectangle, isosceles trapezoid, or antiparallelogram is cyclic. A kite is cyclic if and only if it has two right angles. A bicentric quadrilateral is a cyclic quadrilateral that is also tangential and an ex-bicentric quadrilateral is a cyclic quadrilateral that is also ex-tangential.
Read more about this topic: Cyclic Quadrilateral
Famous quotes containing the words special and/or cases:
“I have a special grudge against those who have the same faults as I do.”
—Mason Cooley (b. 1927)
“There are some cases ... in which the sense of injury breeds—not the will to inflict injuries and climb over them as a ladder, but—a hatred of all injury.”
—George Eliot [Mary Ann (or Marian)