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K kelas = 2(p + l)
= 2(6 + 15)
= 2(21)
= 42 m
= 4200 cm
K ubin = 2(p + l)
= 2(20 + 4)
= 2(24)
= 48 cm
Nomor B ↓
L kelas = p × l
= 6 m × 15 m
= 90 m²
= 900.000 cm²
L ubin = p × l
= 20 cm × 4 cm
= 80 cm²
Nomor C ↓
Ubin = L kelas : L ubin
= 900.000 cm² : 80 cm²
= 11.250