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Orthocenter   all four points together
Angle bisector instructions     Perpendicular bisector instructions
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Instructions for constructing medians and the centroid.

You first need to know how to construct perpendicular bisectors.
Once the perpencicular bisectors are constructed you may proceed.



 

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Construct a line from "B" to "I".  This would be a median (Yellow).



 

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Construct a line from "A" to "J".  This would be a median (Green).
The intersection of "BI" and "AJ" is the Centroid.



 

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Yahoo! It's a Centroid.  The center of gravity.