The circle tangent to all three of the excircles as well as the incircle is known as the nine-point circle. The point wh...
An obtuse triangle is an oblique triangle with one internal angle larger than 90° (an obtuse angle ). An acute trian...
Circumcircles of triangles 1.1 Circumcircle equations 1.2 Coordinates of circumcenter 1.3 Using the cross and dot produc...
This fact provides a tool for proving collinearity of the circumcenter, centroid and orthocenter. The medial triangle is...
Circles of Apollonius may be used as a technical term to denote three special circles defined by an arbitrary triangle A...
Feuerbach quotations Encarta Search Search Encarta about Ludwig Feuerbach Also on Encarta ? 7 tips for funding an ...
Brocard triangle, as further triangles can be formed be forming the Brocard triangle of the Brocard triangle and continu...