Misconceptions concerning rotation and angie in LOGO

Abstract  Twelve children, aged between 10 and 11 years old were given a 12-hour course in LOGO. The course was taught by a teacher whose knowledge of LOGO was extensive. The emphasis was on the relationship between the turtle rotation and the internal angle in plane figures. The children were tested for their knowledge of angle at the start of the course and when it was finished. In spite of the teacher's attempts to make the children aware that it was the external angles of geometric figures through which the turtle turned, almost all the children focused on the internal angles in the final test. The results suggest using LOGO to draw closed figures may lead to a confusion about angle which is not amenable to conventional teacher intervention in a short course of this nature.