Category
page 1Circles defined for a triangle
nine-point circle
circle passing through nine significant concyclic points defined from the triangle
incircle and excircles of a triangle
the largest circle contained in the triangle; it touches (is tangent to) the three sides
Brocard circle
circle constructed from a triangle
Malfatti circles
three circles in a triangle, tangent to each other and the triangle sides
Fuhrmann circle
mathematical concept
Orthocentroidal circle
circle constructed from a triangle
Spieker circle
geometric object
polar circle
circle in triangle geometry
Van Lamoen circle
theorem
Taylor circle
one of the special circles of triangle geometry
Soddy circle
geometric concept
pedial circle
circumcircle of the pedal triangle
circumscribed circle for triangle
thumb|The perpendicular bisectors of the three sides of a triangle pass through the triangle's circumcenter.