A square iron sheet has a circumference of 8dm, and the largest circle is to be cut out. What is the circumference of this circle in dm?
一块正方形铁皮，周长8dm，要剪下一个最大的圆，这个圆的周长是多少dm．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>