Find the lateral area of a cylinder: the circumference of the base is 18.84 cm, and the height is 10 cm.
求圆柱体的侧面积：底面周长是18.84厘米，高是10厘米．
<gadget id="calculator">18.84 * 10</gadget>
<output>188.4</output>

<result>188.4</result>