id: 05258889
dt: a
an: 2008b.00035
au: Topçu, Tahsin; Kertil, Mahmut; Akkoç, Hatice; Yilmaz, Kamil; Önder,
    Osman
ti: Pre-service and in-service mathematics teachers’ concept images of
    radian.
so: Novotná, Jarmila (ed.) et al., Mathematics in the centre. Proceedings of
    the 30th annual conference of the International Group for the
    Psychology of Mathematics Education, PME, Prague, Czech Republic, July
    16‒21, 2006. Vol. 1-5. Prague: Charles University, Faculty of
    Education. Part 5, 281-288 (2006).
py: 2006
pu: Prague: Charles University, Faculty of Education
la: EN
cc: B50 G69
ut: teacher education; trigonometry; radian; conceptual understanding;
    educational research; subject content knowledge
ci: 
li: 
ab: Summary: This study investigates pre-service and in-service mathematics
    teachers’ subject knowledge of radian. Subject knowledge is
    investigated under the theoretical frameworks of concept images and
    cognitive units. Qualitative and quantitative research methods were
    designed for this study. Thirty seven pre-service and fourteen
    in-service mathematics teachers’ completed a questionnaire which aims
    to assess their understanding of radian. Three pre-service and one
    in-service teachers were selected for individual interviews on the
    basis of theoretical sampling. The data indicated that participants’
    concept images of radian were dominated by concept images of degree.
rv: