The height of a cylinder is 5 meters, and the circumference of its base is 3.14 meters. What is the lateral area of the cylinder?
圆柱体的高是5米，它的底面周长是3.14米，这个圆柱体的侧面积是多少．
<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>