Question

помогите!!!!!!!!!!!!!!

Answer 1

#include <iostream>
using namespace std;
int main () {
setlocale(LC_ALL, "Russian");
float a, b, c, P;
cout << "Введите стороны треугольника a, b и c" << endl;
cin >> a >> b >> c;
P = a + b + c;
cout << "P= " << P << endl;
return 0;
}