David Fraivert, Properties of a Pascal points circle in a quadrilateral with perpendicular diagonals,
Forum Geometricorum, 17 (2017) 509--526.
Abstract. The theory of a convex quadrilateral and a circle that forms
Pascal points is a new topic in Euclidean geometry. The theory
deals with the properties of the Pascal points on the sides of a
convex quadrilateral and with the properties of circles that form
Pascal points.
In the present paper, we shall continue developing the theory, and
we shall define the concept of the ``Pascal points circle".
We shall prove four theorems regarding the properties of the
points of intersection of a Pascal points circle with a
quadrilateral that has intersecting perpendicular diagonals.
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