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(a) area of rectangle B = 3 * area of square = 3 * 18 * 18 cm² = 972 cm² 

(b) shaded area of A : unshaded area of A = 1 : 8

meaning if shaded area of A is u cm² , unshaded area of A is 8u cm²

u + 8u = 18 * 18

9u = 324

u = 36

unshaded area of B = 972 – 36 cm² = 936 cm²

 

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