class Program00
{public static void main(String[] args){
System.out.println("Háromszög terület, kerület számító program");
 double a = 30;double b = 35;double c = 40;
double k = a+b+c;
double alap=30;double mag=35;
 double t1 = (alap * mag) /2;
double s = (a + b + c) / 2;
double terulet2 = Math.sqrt(s*(s-a)*(s-b)*(s-c));
 System.out.printf("Kerulet: %.2f\n",  k);
System.out.printf("Terulet: %.2f\n",    t1);
  System.out.printf("Terulet: %.2f\n", terulet2);
 }}