import math

def dist(P1,P2):
    dx = P1['x']-P2['x']
    dy = P1['y']-P2['y']
    return math.sqrt(dx*dx+dy*dy)



L = []
s = 'init'
while s != 'stop':
    try:
        P={}
        P['x']= float(raw_input("inserisci la x: "))
        P['y']= float(raw_input("inserisci la y: "))
      
        if (P['x']*P['y']<0):
            print 'solo punti nel primo e terzo quadrante, reinserisci'
        elif P not in L:
            L.append(P)
        else:
            print "il punto e' gia' in lista, cambia punto"
        print L
        s = raw_input("inserisci 'stop' per terminare, enter o altro per proseguire:")
    except:
        print 'devi inserire numeri, reinserisci'

print L

maxD = 0
xm=None
ym=None

for i in L:
    d = dist(L[0],i)
    if d > maxD:
        maxD = d
        xm = i['x']
        ym = i['y']
print xm,ym

xd = L[0]['x']
yd = L[0]['y']
xs = L[0]['x']
ys = L[0]['y']


if len(L)>3:
    for i in L:
        if (i['x']>xd):
            xd = i['x']
        if (i['x']<xs):
            xs = i['x']


if len(L) > 2:
    sumx = 0
    for i in L:
        sumx+=i['x']
    avgx = sumx/len(L)
    print avgx
    print L[2]['x']
    if L[2]['x'] > avgx:
        print "il terzo punto e' a destra del centro"
    else:
        print "il terzo punto e' a sinistra del centro"


for i in L:
    if (i['x'] == xd) or (i['x'] == xs):
        L.remove(i)

xd = L[0]['x']
yd = L[0]['y']
xs = L[0]['x']
ys = L[0]['y']

for i in L:
    if (i['x']>xd):
        xd = i['x']
        yd = i['y']
    if (i['x']<xs):
        xs = i['x']
        ys = i['y']
area = abs(xs-xd)*abs(ys-yd)
print area