[list=1][*]Create a triangle from three line segments, us the midpoint tool [icon]/images/ggb/toolbar/mode_midpoint.png[/icon] to add a midpoint on one of the sides, and then repeat on an opposite side.[/*][*]Create a line segment connecting both midpoints.[/*][*]Use the measure tool to measure the new line segment and the triangle side below the line segment. [/*][*]Move around a vertex of the triangle, what do you notice?[/*][/list]