from math import sqrt lines = input() a, b, c = map(int, lines.split()) def compute(a, b, c): circumferences = a + b + c # 海伦公式 s = circumferences / 2 areas = sqrt(s * (s - a) * (s - b) * (s - c)) return circumferences, areas circumference, area = compute(a, b, c) print(f"{circumference=:.2f} {...