the sides of a rectangle are3x +y and 7x+2y. find its perimeter
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Step-by-step explanation:
perimeter of a triangle=2(l+b)
but, l=3x+y and b=7x+2y
∴perimeter of the triangle=2(3x+y+7x+2y)
=2(10x+3y)
∴perimeter of the triangle=20x+6y
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