If the height of a cylinder increases by 1 centimeter, the surface area of the cylinder will increase by 31.4 square centimeters. It is known that the original height of the cylinder is 10 centimeters, and what is the original volume in cubic centimeters.
一个圆柱体的高每增加1厘米，这个圆柱体的表面积就增加31.4平方厘米，已知这个圆柱体原来高10厘米，原来的体积是多少立方厘米．
<gadget id="calculator">31.4 / 1 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 10</gadget>
<output>785</output>

<result>785</result>