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If angleB1OA1=60^@ & radius of biggest c...

If `angleB_1OA_1=60^@` & radius of biggest circle is `r.` Accoding to figure trapezium `A_1B_1D_1C_1,C_1D_1D_2C_2,C_2D_2D_3C_3.........` and so on are obtained. Sum of areas of all the trapezium is.

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