The lateral area of a cylinder is 12.56cm**2 and the radius of the bottom is 2dm. What is its height in cm?
一个圆柱体的侧面积是12.56cm**2，底面半径是2dm，它的高是多少cm．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20 * 2</gadget>
<output>125.6</output>

<gadget id="calculator">12.56 / 125.6</gadget>
<output>0.1</output>

<result>0.1</result>