A piece of iron wire is 1900 decimeters long, and after 100 turns on a circular coil, there is still 16 decimeters of thread left. What is the radius of this coil?
一根铁丝长1900分米，在一个圆形线圈上绕满100圈后还留有16分米的线头．这个线圈的半径是多少？
<gadget id="calculator">1_900 - 16</gadget>
<output>1_884</output>

<gadget id="calculator">1_884 / 100 / 3.14 / 2</gadget>
<output>3</output>

<result>3</result>