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a) 1/4 of rectangle A = 25cm³

So area of rectangle A = 25*4 = 100cm³ #

 

b) Since rectangle A : rectangle B = 2 : 5

area of rectangle B = (5/2)100 = 250cm³

So area of unshaded parts = 250 +100 – 2(25) = 300cm³ #

 

c) Area of A : Area of shaded part : Area of unshaded parts

100 : 25 : 300

4 : 1 : 12 #

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