There is a column in front of the theater, the outer perimeter is 314 cm, what is the cross-sectional area of this column in square centimeters?
大戏院门前的有一条圆柱子，外围周长是314厘米，这条柱子的横截面积是多少平方厘米？
<gadget id="calculator">314 / 3.14 / 2</gadget>
<output>50</output>

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

<gadget id="calculator">3.14 * 2_500</gadget>
<output>7_850</output>

<result>7_850</result>