There is no shaded space (indeed, no triangle) so the answer must be 0.
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You either need to find the area of the triangle and subtract it from that of the rectangle OR you find the areas of the bits of the rectangle that are outside the triangle and add them together. Without more details of the triangle, it is not possible to give a more detailed answer.
The area of the shaded region can be gotten by multiplying the area of the circle by the subtended angle of the sector.
The answer depends on what part of the figure is shaded!
It is not possible to answer the question without additional information about the triangle and the rectangle.
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.