Python3 代码

s = input().split()

a = eval(s[0])
b = eval(s[1])
c = eval(s[2])

if ( a + b > c and b + c > a and c + a > b ):
    print ("Perimetro =", f'{a + b + c:.1f}')
else:
    print ("Area = " + f'{(a + b) * c / 2.0:.1f}')