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52/64 = 13/16 (a)

12u = 81

1u = 81/12 =6.75

52u = 6.75 x 52 = 351 (b)

 

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If you zoom in onto a quarter of the square, say, the top right corner, and by breaking it down into smaller squares, you’ll find that 3/16 of the squares are shaded. Since the entire square consists of 4 such shapes, the ratio stays the same. 

Thus, we can see that 3/16 is not shaded, and thus 13/16 is shaded. 

Hence, 3/16 = 81cm^2

13/16 = 351cm^2

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