2(2w + w) = 60

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• سؤال**: إذا كانت قطعة سلك طولها 60 سم يتم ثنيها لتشكّل مستطيلًا طوله ضعف عرضه، فما أبعاد المستطيل؟
• 2(l + w) = 60
• عوّض \( l = 2w \):
• \times 3w = 60 \quad \Rightarrow \quad 6w = 60
• w = 10 \, \text{cm}
• لذلك، الطول \( l = 2w = 20 \, \text{cm} \).

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