Below is library of GSP scripts.
Centroid
Orthocenter
Circumcenter
Circumcircle
Incenter
Incircle
Medial triangle
Orthocenter, Mid-segment triangle
Orthic triangle
Pedal triangle
Nine point circle
Trisecting a line segment
Equilateral triangle, given a side
Square, given a side
Isosceles triangle, given base and altitude
Triangle Centers (H, G, C, and I)
Triangle Centers with Euler Line
Pentagon, given a radius
Pentagon, given a side
Hexagon, given a side
Octagon, given a side
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