The diameter of a semicircle is 6 cm, what is the circumference of the semicircle in cm?
一个半圆形的直径是6厘米，这个半圆形的周长是多少厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

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

<result>15.42</result>