A cylinder has a base radius of 2 cm and a height of 3 cm, what is the volume of the cylinder in cubic centimeters?
一个圆柱的底面半径为2厘米，高是3厘米，圆柱的体积是多少立方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 3</gadget>
<output>37.68</output>

<result>37.68</result>