The lateral area of a cylinder is 188.4 square decimeters, the radius of the base is 3 decimeters, find its height.
一个圆柱的侧面积是188.4平方分米，底面半径为3分米，求它的高．
<gadget id="calculator">2 * 3.14 * 3</gadget>
<output>18.84</output>

<gadget id="calculator">188.4 / 18.84</gadget>
<output>10</output>

<result>10</result>