A ring, the diameter of the outer circle is 12 meters, and the width of the ring is 1 meter, what is the area of the ring?
一个圆环，外圆的直径是12米，环宽1米，圆环的面积是多少？
<gadget id="calculator">12 / 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>