Bài 3
from math import sqrt
from math import pow
def khoang_cach(ax,ay,bx,by):
return sqrt(pow(bx-ax,2)+pow(by-ay,2))
x1=int(input())
y1=int(input())
x2=int(input())
y2=int(input())
x3=int(input())
y3=int(input())
dab=khoang_cach(x1,y1,x2,y2)
dbc=khoang_cach(x2,y2,x3,y3)
dac=khoang_cach(x1,y1,x3,y3)
print("{:.3f}".format(dab))
print("{:.3f}".format(dbc))
print("{:.3f}".format(dac))