from decimal import Decimal, getcontext
from math import sqrt
 
def getArea(a, b, c):
    s = (a + b + c) / Decimal(2.0)
    return (s * (s - a) * (s - b) * (s - c)).sqrt()
 
def main():
    getcontext().prec = 50
    tc = int(input())
    for _ in range(tc):
        r1, r2, r3 = map(Decimal, input().split())
        total = getArea(r1 + r3, r3 + r2, r1 + r2)
        lo = Decimal(0)
        hi = Decimal(1e20)
        for i in range(1, 251):
            mid = (lo + hi) / Decimal(2.0)
            tri1 = getArea(r1 + mid, r3 + mid, r1 + r3)
            tri2 = getArea(r1 + mid, r2 + mid, r1 + r2)
            tri3 = getArea(r2 + mid, r3 + mid, r2 + r3)
            if (tri1 + tri2 + tri3) >= total:
                hi = mid
            else:
                lo = mid
        print("{:.50f}".format(hi))
 
if __name__ == "__main__":
    main()

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