The circumference of a circle is 6.28 meters, what is the circumference of a semicircle drawn from the circle?
圆的周长是6.28米，从该圆上取一个半圆的周长是多少．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">6.28 / 3.14</gadget>
<output>2</output>

<gadget id="calculator">3.14 + 2</gadget>
<output>5.14</output>

<result>5.14</result>