If the lateral expansion of a cylinder is a square with a perimeter of 24 cm, what is the lateral area of the cylinder?
一个圆柱侧面展开是一个周长为24厘米的正方形，圆柱的侧面积是多少．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>