The circumference of the bottom of a cone is 62.8cm, and the height is 30cm. What is its volume in cm**3.
一个圆锥的底面周长是62.8cm，高是30cm，它的体积是多少cm**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">(1/3) * 3.14 * 100 * 30</gadget>
<output>3_140</output>

<result>3_140</result>