After unfolding the side of the cylinder, a rectangle is obtained. The length of the rectangle is 5cm and the width is 6cm. What is the lateral area of the cylinder?
圆柱侧面展开后，得到一个长方形，长方形的长是5cm，宽是6cm，则圆柱的侧面积是多少．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>