A cylinder has a base radius of 2 decimeters and a height of 8 decimeters. Find the volume of the cylinder in cubic decimeters.
一个圆柱形的底面半径是2分米，高8分米，求这个圆柱形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>