Find the lateral area of a cylinder: the diameter of the base is 8 cm, and the height is 15 cm.
求圆柱体的侧面积：底面直径是8厘米，高15厘米．
<gadget id="calculator">3.14 * 8 * 15</gadget>
<output>376.8</output>

<result>376.8</result>