class Triangle
{
private:
x05double a;
x05double b;
x05double c;
public:
x05Triangle():a(0),b(0),c(0){}
x05Triangle(double x,double y,double z):a(x),b(y),c(z){}
x05double cirlce(){return a+b+c;}
x05double area();
};
double Triangle::area()
{
x05double p = (a+b+c)/2;
x05double area = sqrt(p*(p-a)*(p-b)*(p-c));
x05return area;
}