import math
x1 = float(input("Введите x1: "))
y1 = float(input("Введите y1: "))
x2 = float(input("Введите x2: "))
y2 = float(input("Введите y2: "))
d = math.sqrt((x2 - x1)**2 + (y2 - y1)**2)
print("Длина отрезка:", d)
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