Mathematics for IGCSE & O level - Vectors (Section 5 - No. 11)
If A is the point (3, -1) and B is the point (0, 2), what is the magnitude of vector AB?
√10
√13
5
2
Explication
AB = B-A = (0-3, 2-(-1)) = [-3, 3]. Magnitude = √((-3)^2 + 3^2) = √18 = 3√2