51.
Seven Circles
Theorem
![](../circle/seven_circle_theorem_170.jpg)
53. Angle
between two Simson lines Proof |
54.
Steiner's Theorem.
Proof |
55.
100° Isosceles Triangle Problem |
56.
Triangles
![](../triangles_170.jpg)
57.
Triangle with the
bisectors of the exterior angles.
Collinearity
![](../triangleBisect170x100.jpg)
58.Triangle
and squares. 19 theorems, visual
illustrations.![](../new1.gif)
![](../triangle_square/triangle_squares_sat170.jpg)
59.
Triangle
with Squares 0 Two squares.
![](../triangle_square/triangle_squares_01x170.jpg)
60. Triangle with Squares 1: Two squares
Proof |
|