import math

print("Input 6 points")

x1 = int(input("x1: "))
y1 = int(input("y1: "))
x2 = int(input("x2: "))
y2 = int(input("y2: "))
x3 = int(input("x3: "))
y3 = int(input("y3: "))

a=math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))
b=math.sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3))
c=math.sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3))

print(a)
print(b)
print(c)

def length():
    if a==b==c:
        print("equi triangle")
    elif a==b or a==c or b==c :
        print("iso traingle")
    else :
        print("sca traingle")
length()
#def angle():

p=math.acos(((a*a)+(b*b)-(c*c))/2ab)
print(p)