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Let area of rectangle be "a"cm
so square  is 5a
are of square =5*20
100 cm^2

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Let area of square be "x" cm^2. Then, According To Question, Area of square=5×area of rectangle x cm^2 =5×(20) [given] =100 cm^2 Therefore, area of square is 100 cm^2. Cheers! !!!
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