A semicircle of paper has a circumference of 25.7 cm. What is the diameter of this semicircle in centimeters?
一个半圆纸片，它的周长是25.7cm．这个半圆的直径是多少厘米？
<gadget id="calculator">3.14 + 2</gadget>
<output>5.14</output>

<gadget id="calculator">25.7 / 5.14</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>