Answer: 1.
- A 1
- B i<sup>2</sup>
- C 0
- D -1
Correct answer: A. 1
Explanation: i . i = |i||i|cos0 = 1 x 1 x 1 = 1. Any unit vector dotted with itself equals 1.
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