A 12.56 decimeter iron bar is bent into a circular iron ring, what is its radius in decimeters?
用一根12.56分米的铁条弯成一个圆形铁环，它的半径是多少分米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

<result>2</result>