A cylinder, if its height is truncated by 3 centimeters, its surface area is reduced by 18.84 square centimeters. How much does the volume of the cylinder decrease in cubic centimeters?
一个圆柱体，如果把它的高截短3厘米，它的表面积减少18.84平方厘米．这个圆柱的体积减少多少立方厘米．
<gadget id="calculator">18.84 / 3 / 3.14 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1 * 3</gadget>
<output>9.42</output>

<result>9.42</result>