ax,ay=map(int, input().split())
bx,by=map(int, input().split())
cx,cy=map(int, input().split())
dx,dy=map(int, input().split())

def c(x1, y1, x2, y2, x3, y3):
    """
    3点を通る円の中心と半径を取得
    """
    d = 2 * ((y1 - y3) * (x1 - x2) - (y1 - y2) * (x1 - x3))
    if d==0:
      return 0,0,-1
    x = ((y1 - y3) * (y1 ** 2 - y2 ** 2 + x1 ** 2 - x2 ** 2) - (y1 - y2) * (y1 ** 2 - y3 ** 2 + x1 ** 2 - x3 ** 2)) / d
    y = ((x1 - x3) * (x1 ** 2 - x2 ** 2 + y1 ** 2 - y2 ** 2) - (x1 - x2) * (x1 ** 2 - x3 ** 2 + y1 ** 2 - y3 ** 2)) / -d
    r=((x - x1) ** 2 + (y - y1) ** 2)
    return x,y,r

x,y,r=c(ax,ay,bx,by,cx,cy)
if r==-1:
  print('NO')
  exit()
  
if (x-dx)**2+(y-dy)**2==r:
  print('YES')
else:
  print('NO')