Mathematics, 12.12.2021 14:00 ajfijeoinf2750

Does anyone know how to solve this? The question:
The diagram shows a circular wheel board of different sizes. Given the distance between the circle is the same with radius of first circle. If the board is painted white and grey, what is the percentage of the grey area to the white area?

(P/s : Is it similar to area of sector? or not?)

Does anyone know how to solve this?

The question:The diagram shows a circular wheel board of diff

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