Verified answer

Программа:

Python:

a = float(input('a = '))

b = float(input('b = '))

c = float(input('c = '))

p = (a + b + c) / 2

S = (p * (p - a) * (p - b) * (p - c))**0.5

print(f'S = {round(S, 4)}')