Draw a schematic diagram of a cylinder with a base radius of 2cm and a height of 5cm, indicate the data, and calculate its volume.
画一个底面半径为2cm，高5cm的圆柱示意图，标明数据，并计算它的体积．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 5</gadget>
<output>62.8</output>

<result>62.8</result>