The two right-angled sides of a right-angled triangle are 3 decimeters and 4 decimeters respectively. How many cubic decimeters is the difference in the volume of the two rotating bodies obtained by rotating the two right-angled sides as axes respectively?
一直角三角形的两条直角边分别是3分米和4分米，分别以两条直角边为轴旋转一周所得两个旋转体的体积相差多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 3</gadget>
<output>50.24</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">50.24 - 37.68</gadget>
<output>12.56</output>

<result>12.56</result>