A cylindrical bucket has a bottom radius of 2 decimeters and a height of 8 decimeters, what is its volume in cubic decimeters?
一个圆柱形水桶底面半径是2分米，高是8分米，它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 * 8</gadget>
<output>100.48</output>

<result>100.48</result>