If the diameter and height of a cylinder are both 2dm, what is the surface area of the cylinder?
一个圆柱的直径和高都是2dm，这个圆柱的表面积是多少．
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

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