Answer: 12.
- A 0
- B 7
- C 12
- D 24
Correct answer: C. 12
Explanation: |a x b| = |a||b|sin(90) = 3 x 4 x 1 = 12. Cross product is maximum when vectors are perpendicular.
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