A cylinder has a base diameter of 14 cm and a surface area of 1406.72 square centimeters. What is the height of the cylinder in centimeters?
一个圆柱体底面直径为14厘米，表面积1406.72平方厘米，这个圆柱体的高是多少厘米．
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">3.14 * 49 * 2</gadget>
<output>307.72</output>

<gadget id="calculator">1_406.72 - 307.72</gadget>
<output>1_099</output>

<gadget id="calculator">3.14 * 14</gadget>
<output>43.96</output>

<gadget id="calculator">1_099 / 43.96</gadget>
<output>25</output>

<result>25</result>