A cylinder has a base circumference of 31.4 cm and a lateral area of 251.2 cm2, what is its surface area?
一个圆柱体，底面周长31.4厘米，侧面积是251.2平方厘米，它的表面积是多少．
<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">157 + 251.2</gadget>
<output>408.2</output>

<result>408.2</result>