Question

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Answer 1

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