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Let one side be (x+3) and the other side be x:

area = 2(perimeter)

(x+3)*x = 2*2(x+3+x)

x2+3x = 4x+12+4x

x2+3x-8x-12 = 0

x2-5x-12 = 0

Solving the above equation using the quadratic equation formula and a calculator works out to 2 d.p. as:

x = -1.77 or x = 6.77 it must be the latter as dimensions can't be negative.

Therefore the dimensions are 6.77 cm and 9.77 cm

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