The circumference of the base of a cone is 62.8cm, the height is 21cm, what is the volume?
一个圆锥体的底面周长是62.8cm，高是21cm，体积是多少．
<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 * 21</gadget>
<output>2_198</output>

<result>2_198</result>