[color=#980000][b]Students: [/b][/color][color=#000000][br][br]Since you've already used GeoGebra to construct a triangle's Euler Line several times already, feel free to refer to this basic applet (with its own custom[/color][color=#0000ff][b] Euler Line tool[/b][/color][color=#000000]) for reference at any time in the advanced exercises packet you have received. [br][br]Quick question before you begin: [br]Can you tell, just by looking, which colored point is the centroid? orthocenter? circumcenter? [/color]