UE::Geometry::DotPerp

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namespace UE  
{  
    namespace Geometry  
    {  
        template<typename T>  
        T UE::Geometry::DotPerp  
        (  
            const UE::Math::TVector2 < T > & V1,  
            const UE::Math::TVector2 < T > & V2  
        )  
    }  
}  
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dot product of V1 with PerpCW(V2), ie V2 rotated 90 degrees clockwise