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b = 8 cm
a² + b² = c²
15² + 8² = c²
225 + 64 = c²
289 = c²
√289 = √c²
17 = c
Rusuk = 2Ka + Jumlah panjang rusuk tegak
= 2(a + b + c) + (3 × t)
= 2(15 + 8 + 17) + (3 × 20)
= 2(40) + 60
= 80 + 60
= 140 cm
Jumlah = Rusuk × Banyak prisma
= 140 cm × 3
= 420 cm
Sisa = Kawat - Jumlah panjang rusuk 3 prisma
= 5 m - 420 cm
= 500 cm - 420 cm
= 80 cm
Jadi sisa kawat yang tidak terpakai adalah 80 cm (B).
K = 4s
52 = 4s
13 = s
a = d₁ : 2
= 10 cm : 2
= 5 cm
c = s
= 13 cm
a² + b² = c²
b² = c² - a²
b² = 13² - 5²
b² = 169 - 25
b² = 144
√b² = √144
b = 12
d₂ = b × 2
= 12 × 2
= 24 cm
V = La × t
= (1/2 × d₁ × d₂) × t
= (1/2 × 10 × 24) × 30
= 120 × 30
= 3600 cm³
Jadi volume prisma tersebut adalah 3600 cm³ (C).