What is the volume of a cylinder with a base radius of 2 cm and a height of 8 cm?
一个圆柱底面半径2厘米，高8厘米，则它的体积是多少？
<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>