The circumference of a circle is 18.84 cm, what is the circumference of such a semicircle in cm?
一个圆的周长是18.84cm，这样的半圆的周长是多少cm．
<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>