#include <iostream>
#include <math.h>

using namespace std;

void main()
{
	float a, b, c, S, V, p, i = 0, j = 0;
	cout << "Nhap canh a:";
	cin >> a;

	cout << "Nhap canh b:";
	cin >> b;

	cout << "Nhap canh c:";
	cin >> c;

	if ((a < (b + c)) && (b < (a + c)) && (c < (a + b)))
	{
		cout << " a,b,c tao thanh hinh tam giac" << endl;

		V = a + b + c;
		cout << "Chu vi tam giac V=" << V << endl;
		p = V / 2;
		S = sqrt(p*(p - a)*(p - b)*(p - c));
		cout << "Dien tich tam giac S=" << S << endl;

		if ((a == b) && (a == c))
			i = 2;
		if ((a == b) || (a == c) || (b == c))
			i++;
		if ((a == sqrt(pow(b, 2) + pow(c, 2))) || (b == sqrt(pow(a, 2) + pow(c, 2))) || (c == sqrt(pow(b, 2) + pow(a, 2))))
			j++;


				if (i == 2)
					cout << "Tam giac deu";
				else
					if ((i == 1) && (j == 1))
						cout << "Day la tam giac vuong can" << endl;
					else
						if (i == 1)
							cout << "Tam giac can";
						else
							if (j == 1)
								cout << "Tam giac vuong";
							else
								cout << "Day la tam giac thuong" << endl;

	}
	else
		cout << " a,b,c khong tao thanh hinh tam giac" << endl;






}