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= (6cm×20cm) + (8cm×20cm) + (20cm×21cm) + 2(½(21cm+6cm) × 8cm) + (20cm×[√(21cm-6cm)² + (8cm)²]
= 120cm² + 160cm² + 420cm² + 216cm² + 340cm2
= 1.256 cm² ⓒ
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Semoga bermanfaat (*^_^*)
jika merasa terbantu
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