Why cosine theta for calculations?

[Brad_1234]

When figuring the force between 2 points, no angle the result is calculated just by distance (and charge). But when there are 3 points, either 2 charges or more and a point or 3 charges, why is there an angle calculation?

 

[Tide]

I think a good start would be to state the problem clearly. Your description of it is a bit vague.