The top of the Shikumen is a semicircular window with a diameter of 1.2 meters. How long is the wood used for the semicircle?
石库门的顶部是一个半圆形的窗户，它的直径是1.2米，这个半圆形的一周用的木料有多长？
<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">3.14 * 0.6</gadget>
<output>1.884</output>

<gadget id="calculator">1.884 + 1.2</gadget>
<output>3.084</output>

<result>3.084</result>