The diameter of the base of a cone is 20dm and the height is 12dm. What is its volume dm**3.
一个圆锥的底面直径是20dm，高是12dm，它的体积是多少dm**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">(1/3) * 3.14 * 100 * 12</gadget>
<output>1_256</output>

<result>1_256</result>