Find Out Area nd Circumference In PL/SQL

set serveroutput on

declare

rad number(5):=&r1;

ar number(5,2);

circle number(5,2);

pie constant number(5,2):=3.14;

begin

ar:=pie*rad*rad;

circle:=2*pie*rad;

dbms_output.put_line('area of circle is'|| ar);

dbms_output.put_line('circumference is'||circle);

end;

/