The following are links which facilitate certain triangle constructions. I selected ones that I though appropriate for high school students during a demonstration or a lab. Constructing the Centroid
Constructing the Orthocenter
Constructing the Circumcenter
Constructing the Circumcircle
Constructing the Incenter
Constructing the Incircle
Constructing the Medial Triangle
Constructing the Nine-Point Circle and its Center
Constructing a Square when given a side
Constructing an Equilateral Triangle when given a side
Constructing an Orthic Triangle
Constructing a Pedal Triangle
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