A rope with a length of 13 meters is wrapped around the trunk twice, and the remainder is 0.44 meters. What is the radius of the trunk of this tree in meters?
一根长13米的绳子，绕树干2圈，余0.44米，这棵树树干的半径是多少米？
<gadget id="calculator">13 - 0.44</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 2 / 3.14 / 2</gadget>
<output>1</output>

<result>1</result>