A semicircular object has a diameter of 6 decimeters, what is its circumference?
一个半圆形的物体，它的直径是6分米，它的周长是多少分米？
<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>