# Check geometries for whether they are collinear or coplanar

Source:`R/geometry_predicates.R`

`collinear.Rd`

Geometries are collinear if they lie on the same line and coplanar if they lie on the same plane. collinearity can be tested between two curves or three points, weighted points, circles, or spheres. coplanarity can be tested between two surfaces or 4 points, weighted points, or spheres

## See also

Other Predicates:
`constant_in`

,
`geometry_class`

,
`geometry_turns`

,
`has_intersection()`

,
`in_order()`

,
`is_degenerate()`

,
`location_predicates`

,
`parallel()`