The outer circumference of a ring is 37.68 decimeters, and the ring width is 1 decimeter. What is the area of the ring in square decimeters?
一个环形外圆周长37.68分米，环宽1分米，环形的面积是多少平方分米？
<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">113.04 - 78.5</gadget>
<output>34.54</output>

<result>34.54</result>