Find Vector b Given a: |a|=3, Perpendicular to a

[vorcil]

1. Find a.b given the following information
|a|=3

two vectors a.b are perpendicular to each other

b
|
|
|
|__________a


3. |a| = 3
a = squareroot of 3,

if B is a vector perpendicular to a,
dunno what to do from here,

quick response please

 

[djeitnstine]

What are you asking for?

 

[vorcil]

the a.b,

the dot product

 

[Mark44]

One definition for the dot product is
a $\cdot$ b = |a||b| cos($\theta$)
where $\theta$ is the angle between the vectors.