Answer: |a x b|.
- A |a x b|
- B a.b
- C 2|a x b|
- D (1/2)|a x b|
Correct answer: A. |a x b|
Explanation: Area of parallelogram = |a x b|. The area of the triangle formed by these vectors = (1/2)|a x b|.
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