Penjelasan dengan langkah-langkah:
diagonal = akar (12²+9²)
diagonal = akar(225)
diagonal = 15cm
asumsi pita melingkar atas bawah kado
pita² diagonal = (15×4+3×4) = 72cm
pita² horizontal= (12×2+3×2) = 30cm
pita² vertikal = (9×2+3×2) = 24cm
total pita = 72+30+24 = 126cm
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Penjelasan dengan langkah-langkah:
diagonal = akar (12²+9²)
diagonal = akar(225)
diagonal = 15cm
asumsi pita melingkar atas bawah kado
pita² diagonal = (15×4+3×4) = 72cm
pita² horizontal= (12×2+3×2) = 30cm
pita² vertikal = (9×2+3×2) = 24cm
total pita = 72+30+24 = 126cm