public Vetor2D projVetor(Vetor2D vet1) { return(vet1.multiplica(prodEscalar(vet1) / Math.Pow(vet1.norma(), 2))); }
public double angulo(Vetor2D vet1) { return(Math.Acos(prodEscalar(vet1) / (norma() * vet1.norma()))); }