CK-12 Foundation
Ck 12: Vector Addition
[Free Registration/Login may be required to access all resource tools.] Here you'll learn how to add two vectors with either the triangle method or the parallelogram method.
CK-12 Foundation
Ck 12: Trigonometry: Vector Addition
[Free Registration/Login may be required to access all resource tools.] Learn how to add two vectors.
National Council of Teachers of Mathematics
The Math Forum: Vector Addition: Algebra
Illustration and description of how to add vectors using algebra.