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Jawaban:
1).Lp balok = 208 cm²
p = 8 cm
l = 6 cm
Lp = 2(p.l + p.t + l.t)
208 = 2(8.6 + 8.t + 6.t)
208 = 2(48 + 14t)
208 = 96 + 14t
208-96 = 14t
112 = 14t
t = 112/14
t = 8 cm
Vbalok = p × l × t
= 8 × 6 × 8
= 384 cm³
2).Lp = 2(Luas Alas) + (Keliling Alas).tinggi
= 2 × (1/2 × 12 × 9) + (12 + 9 + 15) × 30
= 108 + 1.080
= 1.188 cm²
volume = luas alas × tinggi
= 1/2 × 12 × 9 × 30
= 1.620 cm²
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