The side view of a cylinder is a rectangle with a length of 5.2 cm and a width of 4 cm. What is the lateral area of this cylinder in cm**2.
一个圆柱的侧面展开图是一个长5.2cm、宽4cm的长方形．这个圆柱的侧面积是多少cm**2．
<gadget id="calculator">5.2 * 4</gadget>
<output>20.8</output>

<result>20.8</result>