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s² + s² = c²
8² + 8² = c²
64 + 64 = c²
128 = c²
√128 = √c²
√64×2 = √c²
8√2 = c
b = c : 2
= 8√2 : 2
= 4√2
c = 8
a² + b² = c²
a² = c² - b²
a² = 8² - 4(√2)²
a² = 64 - 16√4
a² = 64 - (16 × 2)
a² = 64 - 32
a² = 32
√a² = √32
√a² = √16×2
a = 4√2
t limas = 4√2 cm
V kubus = s³
= 8³
= 512 cm³
V limas = 1/3 × La × t
= 1/3 × s² × t
= 1/3 × 8² × 4√2
= 1/3 × 64 × 4√2
= 1/3 × 256√2
= 85,33 √2
≈ 85√2 cm³
V gabungan = V kubus + V limas
= 512 + 85√2
= 597√2 cm³
LP kubus = s² × 5
= 8² × 5
= 64 × 5
= 320 cm²
a = 8 cm
b = 8 cm
c = 8 cm
S = K : 2
= (a + b + c) : 2
= (8 + 8 + 8) : 2
= 24 : 2
= 12 cm
L sisi tegak =
=
=
=
=
= cm²
LP limas = Jumlah L sisi tegak
= 4(L sisi tegak)
= 4(16√3)
= 64√3 cm²
LP gabungan = LP kubus + LP limas
= 320 + 64√3
= 384√3 cm²