double Triangle::perimeter()const {
	Vector v1(A, B);
	Vector v2(A, C);
	Vector v3(B, C);
	double A = v1.lengthOfVec();
	double B = v2.lengthOfVec();
	double C = v3.lengthOfVec();
	return (A + B + C);
}

double Triangle::area()const {
	Vector v1(A, B);
	Vector v2(A, C);
	Vector v3(B, C);

	double A = v1.lengthOfVec();
	double B = v2.lengthOfVec();
	double C = v3.lengthOfVec();
	double p1 = perimeter() / 2;
	double res = sqrt(p1*(p1 - A)*(p1 - B)*(p1 - C)); //Хероновата теорема
	return res;
}

Point Triangle::medicenter()const {
	return Point((this->A.getX() + B.getX() + C.getX()) / 3,
		(this->A.getY() + B.getY() + C.getY()) / 3,
		(this->A.getZ() + B.getZ() + C.getZ()) / 3);
}