If the length of the curve obtained by folding a piece of paper in half three times is 1.57 meters, what is the diameter of the circle in meters?
把一张圆纸片三次对折并量得的曲线的长是1.57米，那么圆纸片的直径是多少米．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1.57 / (1/8) / 3.14</gadget>
<output>4</output>

<result>4</result>