The circumference of a stump is 188.4 cm, what is the area of the cross section of the stump?
一根树桩的周长是188.4厘米，这根树桩的横截面的面积是多少？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">188.4 / 6.28</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900</gadget>
<output>2_826</output>

<result>2_826</result>