piece of cardboard is a right triangle, the ratio of the two sides AB to BC is 2:1, and the length of side AB is 6 cm. If it is rotated around the side AB as the axis, what is the volume of the cone formed?
一张直角三角形硬纸板，两条直角边AB与BC的比是2：1，AB边长6厘米，如果以AB边为轴旋转一周，所形成的圆锥的体积是多少立方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<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 * 6</gadget>
<output>56.52</output>

<result>56.52</result>