A rectangular parallelepiped paper with a length of 10 cm and a width of 8 cm is rolled into a cylinder, what is the lateral area of the cylinder in square centimeters?
将一张长10厘米，宽8厘米的长方体纸卷成一个圆柱体，这个圆柱体的侧面积是多少平方厘米．
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>