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= 10 cm : 2
= 5 cm
b = d₂ : 2
= 24 cm : 2
= 12 cm
a² + b² = c²
5² + 12² = c²
25 + 144 = c²
169 = c²
√169 = √c²
13 = c
s = 13 cm
LP = 2(La) + (Ka × t)
= 2(1/2 × d₁ × d₂) + ((4 × s) × 20)
= 2(1/2 × 10 × 24) + ((4 × 13) × 20)
= 2(5 × 24) + (52 × 20)
= 2(120) + 1040
= 240 + 1040
= 1280 cm²