√(x_{2} - x_{1})² + (y_{2} - y_{1})² + (y_{2}) - y_{1})²
2 1/4 2 1/2 1 5/9 2 7/10 3 2/5 2 2/15 2 3/20 4 7/30
√(x_{2} - x_{1})² + (y_{2} - y_{1})² + (y_{2}) - y_{1})²
2 1/4 2 1/2 1 5/9 2 7/10 3 2/5 2 2/15 2 3/20 4 7/30