JavaSketchpad Glossary of Sketches
Matheamtics is not a deductive science – that's a cliché. When you try to prove a theorem, you don't just list the hypotheses, and then start to reason. What you do is trial and error, experimentation, guess-work.
—Paul Halmos (1916– )

This page contain is a glossary of all the JavaSketchpad sketches used in the book for some of the sketches you may want to refer to the sections discussion or exercises.

Chapter Two - Euclidean and Non-Euclidean Geometry

• Exercise 2.1. All triangles are isosceles. (Find error in proof.)
• Exercise 2.2. Rusty Compass Construction/Compass Equivalence Theorem. (Find error in proof.)
• 2.1 Lines in the Poincaré Half-plane and Missing Strip Plane.
• 2.1 Poincaré Half-plane Angle Measure

Chapter Three - Transformational Geometry

• 3.1Tesselation
• 3.1 Transformations -Translation, Rotation, Reflection, Dilation, etc.
• 3.4 Investigation Translation and Rotation
• 3.5 Investigation Reflection and Glide Reflection
• 3.5 Isometry a composition of at most three reflections.
• 3.6 Investigation Dilation

Chapter Four - Plane Projective Geometry

• 4.1 Animation One-Point Perspective
• 4.1 Animation Two-Point Perspective
• 4.1 Perspective view through a pin hole.
• 4.1 Views from different perspectives of a square.
• 4.2 Definition of a complete quadrangle
• 4.2 Perspective from a point and perspective from a line
• 4.2 Perspectivity and projectivity
• 4.3 Definition of a complete quadrilateral
• 4.3 - 4.4 Desargues' Theorem
• 4.5 Quadrangle and Harmonic Set
• 4.5 Construct a Harmonic Conjugate
• 4.5 Harmonic Sets
• 4.5 Harmonic Sets and Music
• 4.6 Perspectivity
• 4.6 Projectivities
• 4.6 Uniqueness of a Projectivity
• 4.6 Cross joins - Alternate construction of a projectivity
• 4.7 Point Conic and Line Conic
• 4.7 Definition of a Hexagon
• 4.7 Diagonal Points of a Hexagon
• 4.7 Pascal's Theorem
• 4.7 Tangent Lines and Point Conics