Question

Which of the following equals the a x b ( a and b are two vectors)?

(a) – (a x b)

(b) a.b

(c) b x a

(d) – (b x a)

This question was posed to me in exam.

This key question is from Computational Geometry topic in portion Computational Geometry of Data Structures & Algorithms II

Answer 1

The correct answer is (d) – (b x a)

Easiest explanation - The vector product a x b is equal to – (b x a). The minus sign shows that these vectors have opposite directions.