what is the area of the shaded part of the circle that has a diameter of 8 mm

what is the area of the shaded part of the circle that has a diameter of 8 mm

what is the area of the shaded part of the circle that has a diameter of 8 mm. There are any references about what is the area of the shaded part of the circle that has a diameter of 8 mm in here. you can look below.

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