The upper base of a right-angled trapezoid is 10cm, the lower base is 16cm, and the height is 8cm. Use the upper base as the axis to rotate once, and find the volume of the obtained rotating body.
一个直角梯形的上底是10cm，下底是16cm，高是8cm，用上底作轴旋转一周，求所得的旋转体的体积．
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 16</gadget>
<output>3_215.36</output>

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

<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<gadget id="calculator">(1/3) * 3.14 * 64 * 6</gadget>
<output>401.92</output>

<gadget id="calculator">3_215.36 - 401.92</gadget>
<output>2_813.44</output>

<result>2_813.44</result>