简单的三角形判别

#include <cstdio>
#include <cmath>
#include <iostream>
using namespace std;

int main() {
    double a,b,c;
    cin >> a >> b >> c;
    if(a + b > c && a + c > b && b + c > a) printf("Perimetro = %.1f", a + b + c);
    else printf("Area = %.1f", (a + b) * c / 2);
    return 0;
}