Mathematics for IGCSE & O level - Vectors (Section 4 - No. 29)
If AB = [4, -1] and CD = [8, -2], what can we say about their relationship?
AB is twice the length of CD
AB and CD have the same direction
AB is half the length of CD
AB and CD are perpendicular
Giải thích
CD is twice the length, and they have the same direction.