interior angles (deg): [289.869, 157.101, 23.159, 189.383, 78.996, 66.166, 119.871]
turning angles: [-1.917574, 0.399669, 2.737398, -0.163758, 1.762853, 1.986779, 1.049457]  sum: 5.854824876
cut at v0, segments 0 and 6, orientation determinants: [-0.467474, 0.051503, 0.034768, -0.484209]
proper crossing: True
