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Kelas : VIII
Bab : Bangun ruang Sisi Datar
Pembahasan :
Luas permukaan balok tanpa tutup = 2(pl + pt + lt) – (pl)
Lp Balok = 2(3 + 1,6 + 1,2) - 3
Lp balok = 11,6 - 3
Lp balok = 8,6
Total biaya = Lp balok x Harga kaca
Total biaya = 8,6 x 50.000
Total biaya = 430.000
= ( 2 x 1,2) + (2 x 1,6) + 3
= 2,4 + 3, 2 + 3
= 8,6 m²
biaya = 8,6 x 50.000
=430000