The lateral area of a cylinder is 25.12 square decimeters, the diameter of the bottom is 2 decimeters, what is its height in decimeters.
一个圆柱的侧面积是25.12平方分米，底面直径是2分米，它的高是多少分米．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

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

<result>4</result>