When the circumference of a semicircle is how many centimeters, the circumference of the circle it is in is 12.56 centimeters.
半圆的周长是多少厘米时，它所在的圆的周长是12.56厘米．
<gadget id="calculator">12.56 / 2</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">6.28 + 4</gadget>
<output>10.28</output>

<result>10.28</result>