Answer: 1.
- A 0
- B [a b c]
- C a x b
- D 1
Correct answer: D. 1
Explanation: By definition of reciprocal vectors: a.a<sub>prime</sub> = 1, a.b<sub>prime</sub> = 0, a.c<sub>prime</sub> = 0. The reciprocal system is the dual basis.
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