A cylinder, if its height is shortened by 2 centimeters, the surface area will be reduced by 12.56 square centimeters, and the volume will be reduced by how many cubic centimeters.
一个圆柱体，如果把它的高截短2厘米，表面积就减少12.56平方厘米，体积减少了多少立方厘米．
<gadget id="calculator">12.56 / 2 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>