A cylinder with a base radius of 2 meters and a height of 5 meters finds its surface area.
一个圆柱底面半径是2米，高是5米，求它的表面积．
<gadget id="calculator">2 * 3.14 * 2 * 5</gadget>
<output>62.8</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">62.8 + 25.12</gadget>
<output>87.92</output>

<result>87.92</result>