This page contains links to some interactive Web pages I have built using Perl, PHP, and MySQL, illustrating various math concepts:

- Modular Arithmetic Calculator - Perform arithmetic and find square roots modulo an integer.
- Find the greatest common divisor of two integers using the Euclidean algorithm.

These pages use a Perl interface to a MySQL database of pro basketball stats.

Graphs use the GD graphics library

- Graph a polynomial and its derivative.
- Plot the trajectory of a cannonball for a given muzzle velocity and angle of elevation.
- Graph solutions of the Lotka-Volterra equations, a differential equations model for predator-prey interactions.
- Draw graphs of ellipses with varying parameters.
- Convert angles between radians and degrees.