inici
1 a 20
20 a 40
40 a 60
60 a 80

 
c1 Brocard points
c2 Anticevian triangle
c3 Tripole
c4 Circle tangent to the circumcircle at a vertex and externally tangent to the incircle
c5 Circle tangent to the circumcircle at a vertex and internally tangent to the incircle
c6 Circle through two vertices and tangent to the incircle
c7 Mannheim circle
c8 Malfatti circles
c9 Circle tangent to the circumcircle at a vertex and tangent to the opposite side
c10 Triangle having its centroid at the incircle
c11 Triangle knowing the vertex A, the circumcenter O and the symmedian point K
c12 Equilateral triangle circumscribed to ABC
c13 Triangle knowing the vertex A, the line r joining A and B and the ninecircle c
c14 Triangle having its vertices on three concurrent lines r1, r2, r3 and as incenter I their concurrence point
c15 Triangles ABC given A and B and such as the circle with diameter AB is tangent to the incircle
c16 Triangles inscribed in ABC and similar to the pedal A'B'C' of a point P
c17 Triangle ABC similar to A'B'C', C being given and A, B in two given lines r, s
c18 Two points M, N isogonals with respect two triangles ABC and A'B'C'
c19 Two tangent circles with the same radius, one of them with center A and the other through B and C
c20 Triangle knowing ra, rb, rc perpendicular bisectors of the sides