The diameter of the base of a cone is 4 decimeters and the height is 12 decimeters. What is the volume in cubic decimeters?
圆锥的底面直径是4分米，高12分米，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">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 12</gadget>
<output>50.24</output>

<result>50.24</result>