#include <stdio.h>
#include <math.h>

void haromszogTKpar(double a, double b, double c, double *t, double *k)
{
	double s;
	*k = (a + b + c);
	s = (*k) / 2.0;
	*t = sqrt((s-a)*(s-b)*(s-c)*s);
}

struct terker {
	double terulet;
	double kerulet;
};

struct terker haromszogTKret(double a, double b, double c)
{
	struct terker ret;
	double s;
	ret.kerulet = (a + b + c);
	s = (ret.kerulet) / 2.0;
	ret.terulet = sqrt((s-a)*(s-b)*(s-c)*s);
	return ret;
}

int main() {
	double a, b, c, t, k;
	struct terker val;
	printf("Adja meg az oldalakat!\n?:");
	scanf("%lf %lf %lf", &a, &b, &c);
	haromszogTKpar(a, b, c, &t, &k);
	val=haromszogTKret(a, b, c);
	printf("T: %lf; K: %lf;\n", t, k);
	printf("T: %lf; K: %lf;\n", val.terulet, val.kerulet);
	return 0;
}