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Let R be the circle centered at (0,0) with radius 10. The lines x = 6 and y = 5 divide R into four regions R1, R2, R3, and R4. Let [Ri] denote the area of region Ri. If [R1] > [R2] > [R3] > [R4], then find [R1]-[R2]-[R3]+[R4].

 May 8, 2020
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[R1] - [R2] - [R3] + [R4] = 140.

 May 8, 2020

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