A cylindrical wood whose base radius and height are both 3 cm, how many cubic centimeters should be cut to form the largest cone
一个底面半径和高都是3厘米的圆柱形木头，削成一个最大的圆椎，应削去多少立方厘米
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3.14 * 9 * 3 * (2/3)</gadget>
<output>56.52</output>

<result>56.52</result>