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Verified answer
Kerangka = 4(p + l + t)456 cm = 4(p + 21 cm + 13 cm)
456 cm = 4p + 84 cm + 52 cm
456 cm = 4p + 136 cm
4p = 320
p = 80 cm
Panjang Seluruh rusuknya 456 cm (bukan 456cm²)
L= 21 cm
T= 13 cm
Panjang semua rusuk = 4 (p + l + t)
456 cm = 4 ( p + 21 + 13 )
456 cm = 4 ( p + 34 )
456 cm = 4p + 136
4p = 456-136
4p = 420
p = 320/4
p = 80 cm
Volume Balok
= p x l x t
= 80 x 21 x 13
= 21.840 cm3