Assertion: tetrahedron's edge | /r/HasProperty | perpendicular
Facets:
value: to one another
type: OTHER
value: at right-angles
type: LOCATION
Source sentences:
text: A tetrahedron composed of two pairs of identical isosceles triangles is such that the two edges that adjoin identical triangles are opposite and perpendicular, and thus such a tetrahedron (or digonal disphenoid) has one twofold rotational axis passing through the centers of the two edges that adjoin identical triangles (in the case where all four triangles are identical and the figure is a tetragonal disphenoid
text: The three edges that meet at the right angle are called the legs and the perpendicular from the right angle to the base is called the altitude of the tetrahedron.
text: The opposite top edge is perpendicular, also level with the ground and goes from front to back.
text: opposite edges are perpendicular (at right-angles) to one another
text: The opposite edges of a regular tetrahedron are perpendicular, and so can form a universal coupling if hinged appropriately.