circular iron ring has an outer radius of 10 cm and an inner radius of 6 cm. What is the area of the iron ring in square centimeters?
一个圆形铁环铁片，它的外圆半径是10厘米，内圆半径是6厘米，铁片的面积是多少平方厘米？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<gadget id="calculator">100 - 36</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<result>200.96</result>