A semicircular flower bed has a radius of 5 cm, what is its circumference in m?
一个半圆形花坛，它的半径是5cm，它的周长是多少m？
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 5 * 1</gadget>
<output>15.7</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">15.7 + 10</gadget>
<output>25.7</output>

<result>25.7</result>