A cylinder has a diameter of 2 decimeters and a lateral area of 25.12 square decimeters. What is the height in decimeters?
一圆柱直径2分米，侧面积25.12平方分米，高多少分米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">25.12 / 6.28</gadget>
<output>4</output>

<result>4</result>