right-angled triangle with sides of 3 cm and 4 cm is rotated around its longer side as the axis. What is the volume of the cone formed?
一个直角三角形，直角边分别是3厘米、4厘米的，以它较长的一条直角边为轴旋转一周，形成的圆锥体积为多少立方厘米．
<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 * 4</gadget>
<output>37.68</output>

<result>37.68</result>