The radius of the inner circle of a circle is 3 meters, and the circumference of the outer circle is 37.68 meters. What is the area of the circle in square meters? After the students solve independently, they make corrections and compare them. What is the difference in the solutions? What is the same in thinking?
一个环形内圆半径是3米，外圆周长是37.68米，这个环形的面积是多少平方米？学生独立解答后，进行订正并比较，解法有什么不同？思路上有什么相同？
<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">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">113.04 - 28.26</gadget>
<output>84.78</output>

<result>84.78</result>