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The area of the shaded region can be gotten by multiplying the area of the circle by the subtended angle of the sector.
72pi
shaded sectors do not appear on listings
That will depend on the length or angle of the arc which has not been given
Well, darling, if you shaded all but three eighths of the rectangle, then the shaded area is 5/8 of the total rectangle. To find the percentage of the rectangle that is not shaded, you subtract the shaded area from 100%. So, 100% - 62.5% (5/8 as a percentage) = 37.5%. Voilà, 37.5% of the rectangle is not shaded.