2. Element metric

2.1 Metric of a triangle

Consider any triangle [V ₁ , V ₂ V ₃ ] with vertices V ₁ , V ₂ and V ₃ , and show that there exists a metric of ${ℝ}^2$ in which the triangle is unity (equilateral with sides of length equal to 1). Let us denote by v _ij the edge vector $$