On a square piece of paper with a circumference of 100 cm, the largest circle is to be drawn, what is the radius of this circle in cm
在一张周长为100厘米的正方形纸片内，要画一个最大的圆，这个圆的半径是多少厘米
<gadget id="calculator">100 / 4 / 2</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>