Pradana, Mohammad. “THE ACTIVITY INFLUENCE USING GEOGEBRA PROGRAM ON CIRCLE SUBJECT OF STUDENT ACHIEVEMENT”. UJMC (Unisda Journal of Mathematics and Computer Science) 1, no. 01 (June 1, 2015): 39-46. Accessed May 4, 2024. http://e-jurnal.unisda.ac.id/index.php/ujmc/article/view/435.