Mean and Mean Deviation
https://mste.illinois.edu/dildine/sketches/Mean.htm

Difference of Two Squares
https://mste.illinois.edu/dildine/sketches/Diff2sq.htm

Brahmagupta's Formula
https://mste.illinois.edu/dildine/sketches/brahmagupta.html

A ROLE FOR TECHNOLOGY IN MATHEMATICS EDUCATION
https://mste.illinois.edu/dildine/sketches/cuocogoldenberg.html

Ellipses
https://mste.illinois.edu/dildine/sketches/ellipse.htm

Hyperbolas
https://mste.illinois.edu/dildine/sketches/Hyperbol.htm

Functions
https://mste.illinois.edu/dildine/sketches/functions

Desargues' Theorem
https://mste.illinois.edu/dildine/sketches/desargues.htm

Geometric Mean
https://mste.illinois.edu/dildine/sketches/geomean.html

Parabolas
https://mste.illinois.edu/dildine/sketches/parabolas.htm
https://mste.illinois.edu/dildine/cabri/parabola.html

Mean Altitude
https://mste.illinois.edu/dildine/sketches/meanalt1.html

Pythagorean Theorem
https://mste.illinois.edu/dildine/sketches/pythagorean.html

Triangles On Circles
https://mste.illinois.edu/dildine/sketches/weigand.html

Cancer and Mathematics
https://mste.illinois.edu/dildine/cancer/

Perspective Drawing
https://mste.illinois.edu/m2t2/geometry/perspective

Exploring Quadrilaterals: Sides, Angles, and Diagonals
https://mste.illinois.edu/m2t2/geometry/quadsDiag.html

Exploring Quadrilaterals: Sides and Angles
https://mste.illinois.edu/m2t2/geometry/quads.html

More Exploring Quadrilaterals: Sides and Angles
https://mste.illinois.edu/m2t2/geometry/quadsInQuads.html