A cylinder has a base diameter of 0.5 meters and a height of 0.8 meters, what is its volume in cubic meters?
一个圆柱的底面直径是0.5米，高0.8米，它的体积是多少立方米？
<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 ** 2</gadget>
<output>0.0625</output>

<gadget id="calculator">3.14 * 0.0625 * 0.8</gadget>
<output>0.157</output>

<result>0.157</result>