This interactive site defines a triangle’s orthocenter, explains why an orthocenter may lie outside of a triangle and allows users to manipulate a virtual triangle showing the different positions an orthocenter can have based on a given triangle.
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Math Open Reference
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This interactive site defines an incenter of a triangle, gives relevant properties of an incenter and allows users to manipulate a virtual triangle showing the different positions an incenter can have based on a given triangle.
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Math Open Reference
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This provides clear instructions on what each point of concurrency in the triangle are and how they can be found, includes applets examining the properties of each center point.
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Various Points Related to Triangles
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