A square of paper with a side length of 10 cm forms a cylinder, what is the lateral area of the cylinder in square centimeters?
一张边长是10厘米的正方形纸皮，围成一个圆柱，这个圆柱的侧面积是多少平方厘米．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<result>100</result>