The following is my library of GSP scripts. You must have Geometer's SketchPad 4.0 installed on your computer to view the following links.

Triangle Centers and related topics

Centroid (given three vertices of a triangle)

Orthocenter (given three vertices of a triangle)

Circumcenter (given three vertices of a triangle)

Circumcircle (given three vertices of a triangle)

Incenter (given three vertices of a triangle)

Incircle (given three vertices of a triangle)

Center of Nine Point Circle (given three vertices of a triangle)

Nine Point Circle (given three vertices of a triangle)

Triangle Centers ( H, G, C, and I ) (given three vertices of a triangle)

Euler Line (given three vertices of a triangle)

Triangles

Medial Triangle (given three vertices of a triangle)

Orthocenter, Mid-segment Triangle (given three vertices of a triangle)

Orthic Triangle (given three vertices of a triangle)

Pedal Triangle (given three vertices of a triangle and an extra point)

Equilateral Triangle(given a side)

Isosceles Triangle (given base and altitude)

Sierpinski's Triangle (given three vertices of a triangle)

Polygons

Square (given a side)

Pentagon (given the endpoints of a side)

Pentagon (given a radius)

Hexagon (given a side)

Octagon (given a side)

Segments

Trisecting a Line Segment (given the endpoints of a side)

Golden Ratio: divide a Segment AB into two parts that form the Golden Ratio.

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