What is the minimum volume of a cone obtained by rotating a right-angled triangle whose two sides are 6cm and 2cm respectively about the axis of the right-angled side?
两直角边分别6cm和2cm的直角三角形，以其中一直角边为轴旋转得到的圆锥体体积最小是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 6</gadget>
<output>25.12</output>

<result>25.12</result>