\left(\pi R^2-\varepsilon\right)H<\sum_{j=1}^n\lambda_2(P_j)H\leq \lambda_3(V)\leq \sum_{j=1}^n\lambda_2(P_j)H + \sum_{i=1}^n\lambda_2(Q_i)H<\left(\pi R^2+\varepsilon\right)H