import sys

from collections import defaultdict, deque, Counter
from heapq import heapify, heappush, heappop, merge
from bisect import bisect_right, bisect_left 
left_binser = lower_bound = bisect_left ; right_binser = upper_bound = bisect_right
from itertools import permutations, combinations, accumulate

# from math import lcm,gcd
# from math import comb, perm
# from functools import lru_cache
# from types import GeneratorType

MOD = 10**9 + 7
_MOD = 998244353

YES = "YES"
NO = "NO"
ALICE = "Alice"
BOB = "Bob"

def FLOOR_DIV(a, b) :
    return a // b
def CEIL_DIV(a, b) :
    return (a // b) + (not(not(a % b)))

def get() :
    return map(int, sys.stdin.readline().split())
def getone() :
    return int(sys.stdin.readline().strip())
def getstr() :
    return sys.stdin.readline().split()
def getonestr() :
    return sys.stdin.readline().strip()
def getarr() :
    return list(map(int, sys.stdin.readline().split()))

def _3d_ARRAY_SPAWN(i, j, k) :
    return [[[0 for _k in range(k)] for _j in range(j)] for _i in range(i)]
def _2d_ARRAY_SPAWN(i, j) :
    return [[0 for _j in range(j)] for _i in range(i)]
   
"""
"never doubt that u can't do this, cause it's an insult to ur determination"
by @deepakgoswami0552 10/03/2024
""" 

                                    
def solve() :
    ...
    # Solution here!
    def area(x1,y1, x2,y2, x3,y3) :
        return 0.5 * abs(x1*(y2 - y3) + x2*(y3 - y1) + x3*(y1 - y2))
    
    x1,y1,x2,y2,x3,y3 = get()

    ans = 0
    for conf in range(64) :

        conf1 = conf & 3
        conf2 = (conf >> 2) & 3 
        conf3 = (conf >> 4) & 3

        a1,a2,b1,b2,c1,c2 = x1,y1,x2,y2,x3,y3
        
        if conf1 == 0 : a1 += 1
        if conf1 == 1 : a1 -= 1
        if conf1 == 2 : a2 += 1
        if conf1 == 3 : a2 -= 1
        
        if conf2 == 0 : b1 += 1
        if conf2 == 1 : b1 -= 1
        if conf2 == 2 : b2 += 1
        if conf2 == 3 : b2 -= 1

        if conf3 == 0 : c1 += 1
        if conf3 == 1 : c1 -= 1
        if conf3 == 2 : c2 += 1
        if conf3 == 3 : c2 -= 1

        ans = max(ans, area(a1,a2, b1,b2, c1,c2))
    
    return ans


""""""
testcase = ""
# testcase = "multiple" # Multiple tc


if testcase == "multiple" :

    for i in range(int(input())) : 
        print(solve())
        # solve()
        ...
else :
    print(solve())
    # solve()
    ...