Submission #3365928

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Source Code Expand

ai = lambda: list(map(int, input().split()))

import numpy as np
import math


def calc(A,B,C):
    a = np.linalg.norm(B - C)
    b = np.linalg.norm(C - A)
    c = np.linalg.norm(A - B)
    cosC = np.inner(A-C, B-C)/(b*a)
    if cosC <= 0:
        return 0
    tanC = math.sqrt(1/(cosC**2)-1)
    return (1 - 1/cosC + tanC) * (a+b-c)/4


a = np.array(ai())
b = np.array(ai())
c = np.array(ai())
print(max(calc(a,b,c),calc(b,c,a),calc(c,a,b)))

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