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**Some links I like.**

The Program of Mathematics Education

MacTutor History of Mathematics Site -- St. Andrew's University

Math Forum(alias Geometry Forum)

Sine CurvesFrom Physics Perspective |
Translation of Quadratic Function |
Quadratic Equation & Roots |

Concurrence & Collinear |
GSP Scripts |
Equilateral Triangle Strategy |

Intersecting Loci Principle |
Area Strategy |
When Is One Worth One Hundred? |

The Helen of Geormetry |
Explore Conics Family |
Spreadsheet & Linear Regression Equation |