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Third grade students recently determined the area and perimeter of large rectangles taped on the classroom floor. Students measured to find the dimensions of the rectangles and calculated both the perimeter and area of each. They discovered that rectangles with equal perimeters can vary greatly in the value of their areas. Students were able to draw models of the actual rectangles on grid paper and prove the results. The young mathematicians realized that the closer the rectangle was to being a square, the greater the area became.