Two vectors with a cross product of zero have this
Two vectors with a cross product of zero have this relationship, which does not exist in elliptic geometry. Euclid's fifth postulate is named for this property. Two lines with this property are (*) equidistant from each other and will have congruent corresponding angles if they are crossed by a transversal. For 10 points, give this term that describes two lines with the same slope, in the same plane, that never intersect.
Two vectors with a cross product of zero have this relationship, which does not exist in elliptic geometry.
parallel