p,q=map(int,input().split())
a,x=map(int,input().split())
b,y=map(int,input().split())
c,z=map(int,input().split())

a-=p
b-=p
c-=p

x-=q
y-=q
z-=q

if (a-b)*(y-z)-(b-c)*(x-y)==0:
	print("NO")
	exit()

from fractions import Fraction

p = Fraction(
	(a*a+x*x)*(y-z) + (b*b+y*y)*(z-x) + (c*c+z*z)*(x-y),
	2 * ((a-b)*(y-z)-(b-c)*(x-y))
)

q = Fraction(
	- ((a*a+x*x)*(b-c) + (b*b+y*y)*(c-a) + (c*c+z*z)*(a-b)),
	2 * ((a-b)*(y-z)-(b-c)*(x-y))
)

r2 = (a-p)*(a-p) + (x-q)*(x-q)

assert r2 == (b-p)*(b-p) + (y-q)*(y-q)
assert r2 == (c-p)*(c-p) + (z-q)*(z-q)

#print(p, q, r2)

if p*p + q*q == r2:
	print("YES")
else:
	print("NO")