The diameter of a semicircle is 2 cm, what is its circumference in cm
一个半圆的直径是2厘米，它的周长是多少厘米
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 + 2</gadget>
<output>5.14</output>

<result>5.14</result>