Дано: ÐaOb, OA = AA1 = A1A2 = A2A3 = A3A4 ,
AB || A1B1
|| A2B2
|| A3B3
|| A4B4
, OB4 = 8 см (рисунок 6).
Нужно найти: OB1
, OB2
, OB3​
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