What is the surface area of a cylinder with a base diameter of 2 decimeters and a height of 1 decimeter.
底面直径是2分米，高是1分米的圆柱体的表面积是多少平方分米．
<gadget id="calculator">3.14 * 2 * 1</gadget>
<output>6.28</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">6.28 + 6.28</gadget>
<output>12.56</output>

<result>12.56</result>