If the height of a cylinder increases by 3 centimeters, the side area increases by 18.84 square centimeters. What is the perimeter of the cylinder in centimeters?
一个圆柱体，它的高增加3厘米，侧面积就增加18.84平方厘米，这个圆柱体的底周长是多少厘米．
<gadget id="calculator">18.84 / 3 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>