87. Point of contact of a tangent to a conic
88. Circumscribed quadrilateral
89. Circumscribed triangle
90. Use of Brianchon’s theorem
91. Harmonic tangents
92. Projectivity and perspectivity
93. Degenerate case
94. Law of duality
PROBLEMS
CHAPTER VI - POLES AND POLARS
95. Inscribed and circumscribed quadrilaterals
96. Definition of the polar line of a point
97. Further defining properties
98. Definition of the pole of a line
99. Fundamental theorem of poles and polars
100. Conjugate points and lines
101. Construction of the polar line of a given point
102. Self-polar triangle
103. Pole and polar projectively related
104. Duality
105. Self-dual theorems
106. Other correspondences
PROBLEMS
CHAPTER VII - METRICAL PROPERTIES OF THE CONIC SECTIONS
107. Diameters. Center
108. Various theorems
109. Conjugate diameters
110. Classification of conics
111. Asymptotes
112. Various theorems