A column in front of the movie theater has a perimeter of 314 cm. What is the cross-sectional area of this column in square decimeters?
电影院门前的一条圆柱子，外围周长是314厘米，求这条柱子的横截面积是多少平方分米？
<gadget id="calculator">314 / 3.14 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 / 100</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<result>78.5</result>