Cut a circular piece of paper with a circumference of 25.12 decimeters into two semicircles along its diameter. What is the circumference of each semicircle in decimeters?
把一个周长是25.12分米的圆形纸片沿直径切成两个半圆，每个半圆的周长是多少分米．
<gadget id="calculator">25.12 / 2</gadget>
<output>12.56</output>

<gadget id="calculator">25.12 / 3.14</gadget>
<output>8</output>

<gadget id="calculator">12.56 + 8</gadget>
<output>20.56</output>

<result>20.56</result>