Java Sketchpad Pages

by James King, University of Washington

These pages were constructed with Geometer's Sketchpad 4 (see below). They are not organized at the moment, and the topics are quite miscellaneous. Perhaps more sketches and better organization will follow in time. Any links to the individual pages may change in the future.

Euclidean and/or Affine Plane Geometry

• Two Centers of Mass of a Quadrilateral
• Affine Transformation of a Quadrilateral
• Affine Image of a Circle is an Ellipse
• Parallel Projection of a Parallelogram
• Affine Coordinates on a Line and on the Plane
• An Example of Barycentric Coordinates and Triangle Area

Projective Geometry

• Desargues Theorem

Poincare Model

• Perpendicular bisector of a segment
• Circle with a given diameter AB

Polyhedra

• Cube with inscribed tetrahedron and octahedron
• Hexagonal cross-sections of cube and dual octahedron

Spherical Geometry via Stereographic Projection

• Polar Great Circle Constructed with a ruler
• Visualizing Stereographic Projection

Euclidean Plane

• Law of Cosines
• Zigzag of Right Triangles

These pages use JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright © 1990-2001 by KCP Technologies, Inc. Licensed only for non-commercial use.