The radius of the base of a cone is 5 decimeters and the height is 12 decimeters. What is its volume in cubic decimeters?
一个圆锥底面半径是5分米，高12分米，它的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 12</gadget>
<output>314</output>

<result>314</result>