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.

**Centroid
**

**Orthocenter**

**Circumcenter**

**Circumcircle**

**Incenter**

**Incircle**

**Medial Triangle**

**Nine-Point Circle** and its Center

**Square** when given a side

**Equilateral Triangle** when given a side

**Orthic Triangle**

**Pedal Triangle**

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