If the radius of the circle in which the semicircle is located is 3 cm, what is the circumference of the semicircle in cm?
已知半圆所在圆的半径为3厘米，那么，这个半圆形的周长是多少厘米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3.14 * 2 * (3/2)</gadget>
<output>9.42</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

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

<result>15.42</result>