SOLUTION

--Static code

set serveroutput on;
DECLARE 
radius number := 6;
area number(7,2);
diameter number(7,2);
circumference number(7,2);
pi constant number := 3.14;
BEGIN
area := pi * radius * radius ;
diameter := 2 * radius; 
circumference := 2 * pi * radius;
dbms_output.put_line('The Area of  Circle is :-'||area);
dbms_output.put_line('The Diameter of a Circle is :-'||diameter);
dbms_output.put_line('The Circumference of a Circle is :-'||circumference);
END;
/
    



--Dynamic code 
set serveroutput on;
DECLARE 
radius number := &radius;
area number(7,2);
diameter number(7,2);
circumference number(7,2);
pi constant number := 3.14;
BEGIN
area := pi * radius * radius ;
diameter := 2 * radius; 
circumference := 2 * pi * radius;
dbms_output.put_line('The Area of  Circle is :-'||area);
dbms_output.put_line('The Diameter of a Circle is :-'||diameter);
dbms_output.put_line('The Circumference of a Circle is :-'||circumference);
END;
/