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Using the formula, Area = Length x Breadth & Area = side² = a² Side of a square = a cm Therefore, Area of rectangle = 5/7 x area of square ⇒ 20 x (3/2) x a = 5/7 x a² ⇒ a = (20 x 7 x 3)/(5 x 2) ⇒ a = 42 cm
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