If the side of a cylinder is expanded to form a square with a side length of 31.4 cm, what is the surface area of the cylinder in cm**2.
一个圆柱的侧面展开后是一个边长为31.4cm的正方形，则这个圆柱的表面积是多少cm**2．
<gadget id="calculator">31.4 * 31.4</gadget>
<output>985.96</output>

<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<gadget id="calculator">985.96 + 157</gadget>
<output>1_142.96</output>

<result>1_142.96</result>