Task: the area of a rectangle is equal to 64 sq. mm. Its width is equal to the party of a square which area of one fourfold part of the square of a rectangle. find rectangle length

The area of a square of 64÷4=16 mm2 the Party of a square с^2=16, with =4mm Means width of a rectangle of 4 mm Let length of a rectangle and, then a*4=64 and = 64÷4 and =16mm Answer: 16 mm rectangle length
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