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= 16 cm : 2
= 8 cm
b = d₂ : 2
= 12 cm : 2
= 6 cm
a² + b² = c²
8² + 6² = c²
64 + 36 = c²
100 = c²
√100 = √c²
10 = c
s = c
= 10 cm
Lp = 2(La) + (Ka × t)
Lp = 2(1/2 × d₁ × d₂) + ((4 × s) × t)
672 = 2(1/2 ×16 × 12) + ((4 × 10) × t)
672 = 2(96) + (40 × t)
672 = 192 + 40t
40t = 672 - 192
40t = 480
t = 12