Construct aCircumcircle(circumcenter.....perpendicular bisectors Why do they only do two?? The definition/theorem says intersection of 3???? Construct anIncircle(incenter....angle bisectors) That last step is to help draw the circle. It touches at a location perpendicular from the point to the side. BTW Median (needs midpoint) Altitude(needs a perpendicular) think of that top point as a vertex (onlinemathlearningvideo.... anothervideo ) 3 altitudes intersect (concurrency) and make an orthocenter (& therefor orthocircle) Midsegment(needs 2 midpointx) Do you know the definitions of these?