There is a large round flower bed downstairs in Grandma Zhang’s house, and the flower bed is surrounded by a 1m-wide gravel path. Every night, Grandma Zhang walks quickly around the inner side of the gravel path (close to the flower bed). On this day, after walking 10 laps, the pedometer It shows a total walking distance of 5024m. How big is the gravel road?
张奶奶家楼下有一个圆形大花坛，花坛周围是宽1m的石子小路，每天晚上张奶奶都绕着石子路的内侧(紧贴花坛)快走，这天，走了10圈后计步器上显示共步行5024m，这条石子路的面积有多大？
<gadget id="calculator">5_024 / 10 / 3.14 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<gadget id="calculator">81 ** 2</gadget>
<output>6_561</output>

<gadget id="calculator">80 ** 2</gadget>
<output>6_400</output>

<gadget id="calculator">6_561 - 6_400</gadget>
<output>161</output>

<gadget id="calculator">3.14 * 161</gadget>
<output>505.54</output>

<result>505.54</result>