cylinder has a base radius of 2 decimeters and a height of 1 decimeter, what is the volume of the cylinder in cubic decimeters?
一个圆柱的底面半径是2分米，高1分米，圆柱的体积是多少立方分米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 1</gadget>
<output>12.56</output>

<result>12.56</result>