Find the volume of a cone with a base radius of 3 cm and a height of 12 cm.
一个圆锥底面半径3cm，高12cm，求体积．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 12</gadget>
<output>113.04</output>

<result>113.04</result>