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This is a Area question. 

1. Area of quadrant B C = 1/4 × 10 × 10 × pi = 25 pi

2. Area of semicircle CD = 1/2 × 5 × 5 × pi = 12.5 pi

3. Difference in Area = 25 pi – 12.5 pi = 12.5pi

  = 12.5 × 3.14 = 39.25

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Note

Difference in Area mean one shape minus the other when they do not overlap totally.

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