Curated OER
Math 212: Vectors
In this vector worksheet, students find the coordinates of a midpoint, compute the position of vectors, and write a vector equation. This two-page worksheet contains four problems.
Other
Rochester Institute of Tech: Cartesian Coordinate System
A picture is shown to represent a position vector in three dimensions. The page explains that a position vector may be named at any point along a curve, and the criterion for a position vector.
Wolfram Research
Wolfram Math World: Radius Vector
Mathworld.com provides a very brief definition of the radius, or position vector. Also gives some properties of the derivative of this vector.