YERLİ SİTELER
http://matematikciler.com/konuanlatimlari/geometri/cemberde-acilar/g12.htm
http://www.ossmat.com/index.php/geometri-testleri/cemberler.html
http://tr.wikipedia.org/wiki/%C3%87ember
http://matematikk.blogcu.com/cemberler/3880785
http://www.matematiktutkusu.com/226-cember-ve-daire-konu-anlatimi-ayrintili-pdf-.html
http://www.matematiknet.com/ygs-lys/269-cemberde-uzunluk-konu-anlatimi.html
http://www.sifircihoca.com/7-sinif-konu-anlatimi/cemberde-acilar-ve-yaylar.html
http://www.frmtr.com/geometri/1438382-cemberde-acilar-genis-anlatim.html
http://bilgiyelpazesi.net/egitim_ogretim/konu_anlatimli_dersler/matematik_dersi_ile_ilgili_konu_anlatimlar/dairede_alan_uzunluk_cevre.asp
http://www.matematiknet.com/ygs-lys/269-cemberde-uzunluk-konu-anlatimi.html
http://geometri.us/geometri-ders-konulari/cemberde-uzunluk.html
http://www.ekolhoca.com/cemberdeuzunluk.asp
http://www.videodershane.com/geometri_konu_anlatimi_ekol_cemberde_uzunluk.htm
YABANCI SİTELER
http://www.math.com/tables/geometry/circles.htm
http://www.cliffsnotes.com/study_guide/Arc-Length-and-Sectors.topicArticleId-18851,articleId-18829.html
http://library.thinkquest.org/20991/geo/circles.html
http://www.coolmath.com/reference/circles-trigonometry.html
http://www.ltcconline.net/greenl/courses/154/factor/circle.htm
