Cut a square piece of paper with a circumference of 2 decimeters into the largest circle, what is the circumference of this circle in centimeters?
把周长是2分米的正方形纸片剪成一个最大的圆，这个圆的周长是多少厘米．
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3.14 * 2 * (5/2)</gadget>
<output>15.7</output>

<result>15.7</result>