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- t = input()
- if t == 'треугольник':
- a = int(input())
- b = int(input())
- c = int(input())
- p = (a + b + c)/2
- print (int(p *(p - a) * (p - b) * (p - c)) ** .5)
- elif t == 'прямоугольник':
- a = int(input())
- b = int(input())
- print(a * b)
- else:
- r = float(input())
- print(3.14 * (r * r))
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