1. Fill in the blanks with 1, the perimeter of the square = (), and the side length of the square = (). 3. To calculate the perimeter of a rectangle, you must know () and (). 4. The sum of two adjacent sides of a rectangle is the perimeter of the rectangle (). 5. The circumference of a square is () times the side length. 6, rectangle, length 13 cm, width 6 cm, circumference is () cm. 7. The side length of a square is 3 cm and the circumference is (). 8.a square swimming pool. It takes 120 meters to walk around this swimming pool. The side length of this swimming pool is () meters. Second, the multiple-choice question 1, the figure surrounded by four sides must be (). A. quadrilateral B. rectangle C. square 2 You can use () to calculate the perimeter of a rectangle.