Some links I like.
The Program of Mathematics Education
MacTutor History of Mathematics Site -- St. Andrew's University
Math Forum (alias Geometry Forum)
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Sine Functions |
Quadratic Functions |
Graphing Quadratics in the xb plane |
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Centers of a Triangle |
Constructions |
Construction of a Parabola |
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Tangent Circles |
Altitudes and Orthocenters |
Pedal Triangles |
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Parametric Equations |
Polar Equations |
Mortgages |