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Help with std 6B #12 on page 82

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Is this Standards edition 6B textbook, or workbook? I looked in both an there is no Review 4 on p. 82. I think you meant US edition. The quarter circle?  The shaded part is not the quarter circle. Think of the square as covering a quarter circle. The side of the square is the radius of the circle. Then there is a diagonal in the square. The shaded part is the section of the quarter circle on one side of the diagonal. So find the area of the quarter circle, with radius 10 cm, and subtract half the area of the square with side 10.

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