The diameter of a circular piece of paper is 2dm. If it is folded in half and then folded in half again, what is the circumference in dm?
一个圆形纸片的直径是2dm，将它对折再对折后，周长是多少dm．
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2)</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 + 2</gadget>
<output>3.57</output>

<result>3.57</result>