I was hoping the “math” might be a Euclidean analysis of how … concave? … or dumbbell-shaped? … a district boundary is. I don’t see how a district that narrows

I was hoping the “math” might be a Euclidean analysis of how … concave? … or dumbbell-shaped? … a district boundary is. I don’t see how a district that narrows to 100 yards wide in the middle could be fair.