Дано: ∠аОb, AB ÎÎ(параллельно) A1B1 ÎÎ A2B2 ÎÎ A3B3 ÎÎ A4B4, OA=AA1=A1A2=A2A3=A3A4.
BB4-B2B3=10 cм
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Рисунок на фото.
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