Cut a cylinder with a base circumference of 12.56 cm and a height of 9 cm into the largest cone. By how many cubic centimeters is the volume reduced?
把一个底面周长是12.56厘米，高9厘米的圆柱体削成一个最大的圆锥．体积减少了多少立方厘米？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3.14 * 4 * 9 * (2/3)</gadget>
<output>75.36</output>

<result>75.36</result>