The lateral area of a cylinder is 251.2 square decimeters, the radius of the bottom is 8 decimeters, what is its height in decimeters.
一个圆柱的侧面积是251.2平方分米，底面半径是8分米，它的高是多少分米．
<gadget id="calculator">2 * 3.14 * 8</gadget>
<output>50.24</output>

<gadget id="calculator">251.2 / 50.24</gadget>
<output>5</output>

<result>5</result>