Answer: k.
- A -k
- B j
- C k
- D i
Correct answer: C. k
Explanation: i x j = k (follows the right-hand rule and cyclic order: i x j = k, j x k = i, k x i = j).
Triangle law of vector addition: placing vector b at the head of vector a, the diagonal from the start to the final head gives the resultant a + b.
Concept context
Vectors, dot product, cross product, and geometric applications