SOLUTION

--Static code

 set serveroutput on;
DECLARE
   base_triangle NUMBER := 10 ; 
   height_triangle NUMBER := 5; 
   area_triangle NUMBER; 
BEGIN
      area_triangle := (base_triangle * height_triangle) / 2;
      DBMS_OUTPUT.PUT_LINE('The area of the triangle is ' || area_triangle);  
END;
    



--Dynamic code 
set serveroutput on;
DECLARE
   base_triangle NUMBER := &base_triangle ; 
   height_triangle NUMBER := &height_triangle; 
   area_triangle NUMBER; 
BEGIN
      area_triangle := (base_triangle * height_triangle) / 2;
      DBMS_OUTPUT.PUT_LINE('The area of the triangle is ' || area_triangle);  
END;
/