A circular part, the radius of the outer circle is 10 cm, the width of the ring is 3 cm, what is the area of the circular part in square centimeters?
一个环形零件，外圆半径是10厘米，环形宽是3厘米，环形零件的面积是多少平方厘米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">100 - 49</gadget>
<output>51</output>

<gadget id="calculator">3.14 * 51</gadget>
<output>160.14</output>

<result>160.14</result>