CK-12 Foundation
Ck 12: Vector Sum and Difference
[Free Registration/Login may be required to access all resource tools.] Looks at finding the direction and magnitude of vectors and breaking vectors into component parts.
CK-12 Foundation
Ck 12: Resultant as Magnitude and Direction
[Free Registration/Login may be required to access all resource tools.] A collection of resources on how to express vectors in magnitude and direction form and determine the magnitude and direction of their sum.
Khan Academy
Khan Academy: Add Vectors: Magnitude and Direction to Component
Add two vectors in magnitude and direction form to get a new vector in component form. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.