Bend a rectangle with 16cm long wire and an isosceles triangle with 5cm waist length with 18cm long wire. If the area of the rectangle is equal to that of the isosceles triangle, the side length of the rectangle is______ cm．

Let the side length of the rectangle be xcm, (162-x) · x = 12 × (18-5-5) × 52 − 42. X = 2 or x = 6. Therefore, the side length of the rectangle is 2cm or 6cm

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