What is the volume of a cone with a base radius of 2 decimeters and a height of 1.5 decimeters?
底面半径2分米，高1.5分米的圆锥体的体积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 1.5</gadget>
<output>6.28</output>

<result>6.28</result>