Check geometries for parallelitySource:
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.
# Are two triangles parallel (only meaningful in 3D) p <- point(sample(20, 6), sample(20, 6), sample(20, 6)) t1 <- triangle(p, p, p) t2 <- triangle(p, p, p) parallel(t1, t2) #>  FALSE # Same as: parallel(as_plane(t1), as_plane(t2)) #>  FALSE # Parallelity of surface and curve parallel(t1, line(p, p)) #>  FALSE