lop_triangle_2.py

from math import *

class Point:
    def __init__(self, tu, mau):
        self.tu = tu
        self.mau = mau
    
    def distance(self, o):
        return sqrt((self.tu - o.tu) ** 2 + (self.mau - o.mau) ** 2)

class Triangle:
    def __init__(self, p1:Point, p2:Point, p3:Point):
        self.p1 = p1
        self.p2 = p2
        self.p3 = p3

    def cal(self):
        a = self.p1.distance(self.p2)
        b = self.p2.distance(self.p3)
        c = self.p1.distance(self.p3)
        if a + b <= c or b + c <= a or a + c <= b:
            return 'INVALID'
        p = (a + b + c) / 2
        s = sqrt(p*(p - a)*(p - b)*(p - c))
        return f'{s:.2f}'

if __name__ == '__main__':
    a = []
    n = int(input())
    for _ in range(n):
        a += [float(i) for i in input().split()]
    for i in range(0, 6*n, 6):
        tgl = Triangle(Point(a[i], a[i+1]), Point(a[i+2], a[i+3]), Point(a[i+4], a[i+5]))
        print(tgl.cal())