What is the surface area of a cylinder with a base radius of 1 meter and a height of 2 meters?
底面半径是1米，高是2米的圆柱体，它的表面积是多少平方米．
<gadget id="calculator">2 * 3.14 * 1 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 + 6.28</gadget>
<output>18.84</output>

<result>18.84</result>