If the circumference of a semicircle is 10.28 cm, what is the circumference of the entire circle in cm?
一个半圆周长是10.28厘米，整个圆的周长是多少厘米．
<gadget id="calculator">2 + 3.14</gadget>
<output>5.14</output>

<gadget id="calculator">10.28 / 5.14</gadget>
<output>2</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<result>12.56</result>