A right-angled triangle, the two sides of which are 3 cm and 2 cm respectively, rotates around the longer side as the axis, and a cone can be obtained. What is its volume?
一个直角三角形，两条直角边分别是3厘米和2厘米，以较长的直角边为轴旋转一周，可以得到一个圆锥体，它的体积是多少？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 4 * 3 * (1/3)</gadget>
<output>12.56</output>

<result>12.56</result>