If two geometries are parallel they have the same orientation. euclid allows
assessing parallelity of a broad range of geometries. If
surfaces the parallelity of their supporting plane is returned. If
y are curves, the parallelity of their supporting line is returned. If it
is a mix of surface and curve, the parallelity is calculated as whether the
supporting plane and supporting line intersects at a point.
vectors of geometries
a logical vector giving the parallelity of the input