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Kelas 8 MatematikaBab Bangun Ruang
Luas permukaan kubus tanpa tutup
= 5 . s . s
= 5 . 12 . 12
= 720 dm²
Banyak ubin yang diperlukan
= 720 dm² / (20 cm . 20 cm)
= (720 . 100 cm²) / 400 cm²
= 180 ubin
✩✩ C ✩✩