Jawaban:
Bagian A
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Dik = panjang seluruh rusuk = 120 cm
Dit = ukuran salah satu rusuk kubus = ...?
Penyelesaian :
r = seluruh panjang rusuk ÷ 12
r = 120 ÷ 12
r = 10 cm
Bagian B
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Dik = r = 10 cm
Dit = v = ...?
Penyelesaian :
V = r³
V = 10³
V = 10 × 10 × 10
V = 1.000 cm³
Bagian C
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Dik = v = 1.000 cm³
p = 25 cm
l = 4 cm
Dit = t = ...?
Penyelesaian :
T = V ÷ ( p × l)
T = 1.000 ÷ ( 25 × 4 )
T = 1.000 ÷ 100
T = 10 cm
Bagian D
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Dik = P = 25 cm
L = 4 cm
T = 10 cm
Dit = lp = ...?
Penyelesaian :
Lp = 2 ( p × l ) + ( p × t ) + ( l × t)
Lp = 2 ( 25 × 4 ) + ( 25 × 10 ) + ( 4 × 10 )
Lp = 2 ( 100 + 250 + 40 )
Lp = 2 × 390
Lp = 780 cm²
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