If a cylinder has a base diameter of 2 decimeters and a height of 5 decimeters, what is its surface area in square decimeters?
一个圆柱的底面直径是2分米，高是5分米，它的表面积是多少平方分米．
<gadget id="calculator">3.14 * 2 * 5</gadget>
<output>31.4</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">31.4 + 6.28</gadget>
<output>37.68</output>

<result>37.68</result>