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2886.34 mm

Step-by-step explanation:

The radius of the disc is given to be 35 millimeters. This means that the distance from the edge of the large circle to the center is 35 millimeters.

We need to find the large circle area and subtract the small circle area from it.

Large circle area:

Area = π

        = π

        = 1225π

The radius of the small circle is half the radius of the large circle. 35/2 = 17.5

Small circle area:

Area = π

        = π

        = 306.25π

Large circle - small circle =

1225π - 306.25π = 918.75π

                            = 2886.34 mm

answer: procent 54 wynosi 33,33%

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