This paper is a review of literature on the child’s development of the angle concept. Children have difficulties understanding angles that stem from the lack of salience of the angle in general representations and particular angle situations, the wide variety of particular angle situations, and the fact that there is no single angle concept but rather multiple angle concepts. General frameworks for considering the development of the angle concept are discussed, as well as teaching experiments with concrete materials, Logo software and paper and pencil activities. It is found that development of a robust understanding of angles is a difficult task that requires extensive experience with a broad range of angle situations. Angle Concept 2 Angle Concept Formation in Elementary Age Childre
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