Google Classroom
GeoGebraGeoGebra Classroom

The Monge Point

The six planes through the midpoints of the edges of a tetrahedron and perpendicular to the opposite edges concur in a point known as the Monge point. Rotate the 3D view. You can show and hide the planes and the intersection lines of the planes in the Algebra view on the left. Click on each "+" to show the lines and planes.