A rectangle with a perimeter of 72 centimeters is composed of three squares of exactly the same size. What is the side length of one of the squares in centimeters?
周长是72厘米的长方形，它正好由三个大小完全相等的正方形拼成，其中一个正方形的边长是多少厘米．
<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<result>9</result>