It is known that after a large square is cut into two small rectangles on average, the sum of the perimeters is 18 cm longer than the perimeter of the original square. What is the perimeter of the original square in centimeters?
已知一个大正方形平均剪成两个小长方形后，周长之和比原来的正方形周长增长了18厘米，求原来的正方形的周长是多少厘米？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>