Function arc_segment_length 

pub fn arc_segment_length(
    start: (f64, f64),
    end: (f64, f64),
    rx: f64,
    ry: f64,
    x_axis_rotation: f64,
    large_arc_flag: bool,
    sweep_flag: bool,
) -> f64

Computes the length of an elliptical arc segment according to the SVG specification.