If the circumference of a circle is 62.8 cm, what is the circumference of the semicircle it is in?
一个圆的周长是62.8厘米，它所在的半圆形的周长是多少厘米．
<gadget id="calculator">62.8 / 2</gadget>
<output>31.4</output>

<gadget id="calculator">62.8 / 3.14</gadget>
<output>20</output>

<gadget id="calculator">31.4 + 20</gadget>
<output>51.4</output>

<result>51.4</result>