function Area($T)
{
$a = new TPoint($T->getAx(), $T->getAy());
$b = new TPoint($T->getBx(), $T->getBy());
$c = new TPoint($T->getCx(), $T->getCy());
$l1 = Leng1($a, $b);
$l2 = Leng1($b, $c);
$l3 = Leng1($c, $a);
$p = $l1 + $l2 + $l3;
//SABC = (p·(p − |AB|)·(p − |AC|)·(p − |BC|))1/2,
return sqrt($p * ($p - $l1) * ($p - $l2) * ($p - $l3));
}
}
/**
* @param mixed $X
*/
public function setX($X)
{
$this->X = $X;
}
/**
* @return mixed
*/
public function getX()
{
return $this->X;
}
function __construct($A, $B)
{
$this->setY($B);
$this->setX($A);
}
}
$a = new TPoint(4, 5);
$b = new TPoint(10, 15);
function Leng1($a, $b)
{
$length = pow($a->getX() - $b->getX(), 2) + pow($a->getY() - $b->getY(), 2);
$len = sqrt($length);
return $len;
}
echo Leng1($a, $b);
