A circular flower bed is paved with a corridor outside, the radius of the flower bed is 5 meters, and the width of the corridor is 3 meters. How many square meters does this circle of corridors cover?
一个圆形花坛，外面铺了一条甬道，花坛半径为5米，甬道宽3米．这圈甬道的占地面积是多少平方米？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

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

<gadget id="calculator">64 - 25</gadget>
<output>39</output>

<gadget id="calculator">3.14 * 39</gadget>
<output>122.46</output>

<result>122.46</result>