A cylindrical piece of wood is 5m long, and the diameter of the cross section is 4dm. If this piece of wood is sawed into two pieces at a ratio of 1:3, what is the volume of the longer piece in dm**3.
一根圆柱形木料长5m，橫截面的直径是4dm，如果将这根木料按1：3锯成两段，较长一段的体积是多少dm**3．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 4 * 50 * (3/4)</gadget>
<output>471</output>

<result>471</result>