There is a cylinder with a height of 10 cm. If its height is reduced by 2 cm, the surface area of the obtained cylinder is reduced by 12.56 square centimeters compared to the original one. Find the volume of the original cylinder?
有一个高10厘米的圆柱，如果将它的高减少2厘米后，得到的圆柱的表面积比原来减少12.56平方厘米，求原来圆柱的体积？
<gadget id="calculator">12.56 / 2 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>