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Bab Bangun RuangMatematika SMP Kelas VIII
Balok
luas permukaan = 2 x (p . l + p . t + l . t)
= 2 x (15a . 12a + 15a . 9a + 12a . 9a)
= 2 x (180a² + 135a² + 108a²)
= 2 x 423a²
= 846a² cm²