None because a tetrahedron is a triangular based pyramid with 4 faces, 6 edges and 4 vertices
None. Each face is an equilateral triangle.
a tetrahedon
5 vertices
4 right angles, no other angles.
2 lines of symmetry
It has 6 angles, none of which are right angles.
6 edges and 4 corners
Four. The prefix "tetra" means four.
0 right angles
A regular hexagon as no right angles. An irregular hexagon could have from none to as many as five right angles.
a tetrahedron has 3 Right angles
A square has 4 right angles.