4 papers · 1 filter
More Shapes of Central Quadrilaterals
Stanley Rabinowitz, Ercole Suppa
Let E be a point in the plane of a convex quadrilateral ABCD. The lines from E to the vertices of the quadrilateral form four triangles. If we locate a triangle center in each of t…
A Triad of Circles Associated with a Triangle
Ercole Suppa, Stanley Rabinowitz
We study some properties of a triad of circles associated with a triangle. Each circle is inside the triangle, tangent to two sides of the triangle, and externally tangent to the c…
Properties of Ajima Circles
Stanley Rabinowitz, Ercole Suppa
We study properties of certain circles associated with a triangle. Each circle is inside the triangle, tangent to two sides of the triangle, and externally tangent to the arc of a…
Inequalities For Distances Between Triangle Centers
Stanley Rabinowitz
In his seminal paper on triangle centers, Clark Kimberling made a number of conjectures concerning the distances between triangle centers. For example, if denotes the dis…