21) A square has a side of 15 cm If to such squares are placed next to each other so that their sides touch, find the perimeter of the resulting rectangle
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side of square=15cm
length of rectangle formed = (15+15) CM = 30 CM
breadth of rectangle = 15 CM
perimeter of rectangle = 2(l+b)
= 2(15+30) =2x45=90cm
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