In a right triangle, the two sides are 3 cm and 4 cm, and the hypotenuse is 5 cm. Rotate this triangle around the axis of 4 cm to get a three-dimensional figure. What is the volume of this three-dimensional figure in cubic centimeters?
一个直角三角形，两条直角边分别是3厘米、4厘米，一条斜边是5厘米．将此三角形以4厘米为轴旋转一周，得到一个立体图形，这个立体图形的体积是多少立方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">3.14 * 9 * 4 * (1/3)</gadget>
<output>37.68</output>

<result>37.68</result>