Cut a circle whose inner circumference is 18.84cm into two equal semicircles, what is the circumference of each semicircle?
把一内周长是18.84cm的圆，剪成两个等半圆，每个半圆的周长是多少．
<gadget id="calculator">18.84 / 2</gadget>
<output>9.42</output>

<gadget id="calculator">18.84 / 3.14</gadget>
<output>6</output>

<gadget id="calculator">9.42 + 6</gadget>
<output>15.42</output>

<result>15.42</result>