  The book is designed for a semester-long course in Foundations of Geometry
and meant to be rigorous, conservative, elementary and minimalist.
  List of topics:
  Euclidean geometry: The Axioms / Half-planes / Congruent triangles /
Perpendicular lines / Similar triangles / Parallel lines / Triangle geometry.
  Inversive geometry: Inscribed angles / Inversion.
  Non-Euclidean geometry: Neutral plane / Hyperbolic plane / Geometry of
h-plane.
  Additional topics: Affine geometry / Projective geometry / Spherical geometry
/ Projective model / Complex coordinates / Geometric constructions / Area.
