Function overloading by name of parameters

SET SERVEROUTPUT ON

DECLARE
     FUNCTION getArea(v_radious NUMBER, v_precision NUMBER) RETURN NUMBER IS
     l_pi NUMBER := 3.14;
     BEGIN
          RETURN TRUNC((l_pi *(v_radious ** 2)),v_precision);
     END;
     FUNCTION getArea(v_length NUMBER ,v_width NUMBER) RETURN NUMBER IS
     BEGIN
          RETURN(v_length * v_width);  
     END;
BEGIN
     DBMS_OUTPUT.PUT_LINE('Area of Circle is '|| 

                getArea(v_radious =>6.4, v_precision => 2));
     DBMS_OUTPUT.PUT_LINE('Area of Rectangle is '|| 

                getArea(v_length => 6,v_width => 4));
END;