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2021. EFEKTIVITAS BAHAN AJAR E-MODUL INTERAKTIF BERBASIS ANDROID UNTUK PENINGKATAN PEMAHAMAN KONSEP LINGKARAN KELAS VI SD: Effectiveness Of Android-Based Interactive E-Module Teaching Materials To Increase Understanding Of The Concept Of Circles In The Fourth Grade Of Elementary School. Fenomena. 20, 2 (Sep. 2021), 219–232. DOI:https://doi.org/10.35719/fenomena.v20i2.61.