A square piece of silk fabric, made into a small square handkerchief with a side length of 12cm or a large square handkerchief with a side length of 18cm, there is nothing left. What is the minimum side length of this square piece of silk cloth in cm?
一块正方形的丝绸布料，做成边长是12cm的小方手绢或做成边长是18cm的大方手绢都没有剩余．这块正方形丝绸布料的边长至少是多少cm．
<gadget id="calculator">2 * 2 * 3 * 3</gadget>
<output>36</output>

<result>36</result>