Point inside a tetrahedron joined to corners creates how many new internal planes? When a point inside of a tetrahedron (a solid with four triangular surfaces) is connected by
straight lines to its corners, how many (new) internal planes are created with these lines?
How do we visualize this?
Are some tools available online, for creating such a geometry?

Earlier the tetrahedron had 4 points in space.It has a total of 4 planes. After adding an internal point we now have 5 points in the space. If we take any three points we can form a plane. so total planes we can form now with 5 points is 5c3 = 10.
So the number of new planes=10-4=6
