أوجدي محيط المضلع المجاور, 9+6+7=22, 9 × 6 × 7=378, 9×6+7=61, مربع طول ضلعه 5 سم أوجدي محيطه, 9, 20, 625, . محيط خماسي منتظم طول ضلعه 2سم, 6, 2+2+2+2+2=10, 20

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