Cross Product (Vector)

|A × B| = |A||B| sinθ — a vector.

Direction: right-hand rule, perpendicular to both A and B.

|A × B| equals the area of the parallelogram formed by A and B.

A × B = −(B × A). A × A = 0.

Torque τ = r × F; angular momentum L = r × p — both are cross products.