angle is left or right of an object?

I'm trying to figure out how to form the condition if a x,y position is left or right relative to an object that rotates.

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                           a

                          <-       +>

                                   b

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so a is to the right of - man and b is to the right of + man

in the angle difference formula both would turn up :90

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ha just figured it out after typing this

if AngleDiff(<-.Value('ang'), <-.Angle-90)lower than 90

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to help clarify <-.Value('ang') is angle(<-.X, <-.Y, a.X, a.Y)

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guess ill still keep this up for people that might face a similar problem.