# https://yukicoder.me/problems/no/3437

MOD = 998244353

def projection(l, a):
    x = (l[2] * (a[0] - l[0]), l[2] - a[2])
    y = (l[2] * (a[1] - l[1]), l[2] - a[2])
    return x, y

def substruct(b, a):
    """ b - a"""
    v0 = b[0] * a[1] - a[0] * b[1]
    v1 = b[1] * a[1]
    return v0, v1


def calc_vec(b_proj, a_proj):
    return substruct(b_proj[0], a_proj[0]), substruct(b_proj[1], a_proj[1])

def outer_product(v0, v1):
    v0_x, v0_y = v0 
    v1_x, v1_y = v1

    w0 = v0_x[0] * v1_y[0], v0_x[1] * v1_y[1]
    w1 = v1_x[0] * v0_y[0], v1_x[1] * v0_y[1]
    return substruct(w0, w1)

def solve(a, b, c, l):
    a_proj = projection(l, a)
    b_proj = projection(l, b)
    c_proj = projection(l, c)

    vec_ab = calc_vec(b_proj, a_proj)
    vec_ac = calc_vec(c_proj, a_proj)

    o = outer_product(vec_ab, vec_ac)
    if o[0] == 0:
        return 0
    elif o[0] < 0:
        o = -o[0], o[1]

    ans = o[0] % MOD, o[1] % MOD
    ans = (ans[0] * pow(ans[1], MOD - 2, MOD)) % MOD
    ans *= pow(2, MOD - 2, MOD)
    ans %= MOD
    return ans


def main():
    T = int(input())
    answers = []
    for _ in range(T):
        a = tuple(map(int, input().split()))
        b = tuple(map(int, input().split()))
        c = tuple(map(int, input().split()))
        l = tuple(map(int, input().split()))
        ans = solve(a, b, c, l)
        answers.append(ans)
        
    for ans in answers:
        print(ans)






if __name__ == "__main__":
    main()