public function getOrdinateByAbscissa($x)
    {
        $o = $this->getPointO();
        return (sqrt(pow($this->getRadius(), 2) - pow(($x - $o->getAbscissa()), 2)) + $o->getOrdinate());
    }
public function getOrdinateByAbscissa($x)
    {
        $o = $this->getPointO();
        return (sqrt(pow($this->getRadius(), 2) - pow(($x - $o->getAbscissa()), 2)) + $o->getOrdinate());
    }
public function getOrdinateByAbscissa ( $ x ) { $ o = $ this -> getPointO ( ) ; return ( sqrt ( pow ( $ this -> getRadius ( ) , 2 ) - pow ( ( $ x - $ o -> getAbscissa ( ) ) , 2 ) ) + $ o -> getOrdinate ( ) ) ; }
Get the ordinate of a point of the circle by its abscissa

y = sqrt( r^2 - (x - Ox)^2 ) + Oy

@param   float   $x
@return  float
Get the ordinate of a point of the circle by its abscissa