\input zb-basic \input zb-matheduc \iteman{ZMATH 1992a.00671} \itemau{de la Rocque Palis, G.} \itemti{Understanding the circumference of the circle in elementary school. Comprimento da Circunferencia no Ensino Elementar. Zum Verstaendnis des Kreisumfangs in der Sekundarschule.} \itemso{Rev. Professor Mat. (1989) (no.14) p. 29-37. [ISSN 0102-4981]} \itemab \itemrv{~} \itemcc{G33 D43} \itemut{Perimeter; Area; Circles; Educational Analysis; Textbook Analyses; Elementary Geometry; Secondary Schools; Pi; ; Umfang; Flaecheninhalt; Kreis; Didaktische Analyse; Schulbuchanalyse; Elementare Geometrie; Sekundarschule; Pi} \itemli{} \end