Use a piece of rectangular paper with a length of 8 cm and a width of 5 cm to form the largest cylinder. What is the lateral area of this cylinder in square centimeters?
用一张长8厘米，宽5厘米的长方形纸片围成一个最大的圆柱，这个圆柱的侧面积是多少平方厘米．
<gadget id="calculator">3.14 * 8 * 5</gadget>
<output>125.6</output>

<result>125.6</result>