Two vectors are PERPENDICULAR iff:
A|ā| = |b̄|
Bā × b̄ = 0
Cā · b̄ = 0
Dā + b̄ = 0
Answer & Solution
Correct answer: C. ā · b̄ = 0
Dot product ā · b̄ = |ā||b̄|cos θ = 0 iff cos θ = 0 iff θ = 90°. So zero dot product = perpendicular vectors. (Zero cross product = parallel/collinear vectors.)
Related questions
The result a cross b is a:The area of a triangle from its three vertices can be found using:The area of a parallelogram with sides a and b uses the magnitude of their:For mutually perpendicular unit vectors, i cross j equals:The cross product of two nonzero vectors is zero when they are:The angle between two vectors can be found in terms of their:The vector product is an operation that is:The scalar product is an operation that is: