The students in the science and technology group made an electromagnet. A thin copper wire with a length of 628 cm was used to wind a cylinder 100 times before it was used up. What is the approximate cross-sectional area of the cylinder?
科技组同学制作电磁铁，用一根长628厘米的细铜线缠绕一个圆柱100圈后正好用完，这个圆柱的横截面的面积大约是多少？
<gadget id="calculator">628 / 100 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>