The circumference of a circular pool is 25.12 meters. Now lay non-slip bricks with a width of 1 meter around the pool. What is the area of the non-slip bricks?
一个圆形水池的周长是25.12米，现在水池周围铺上1米宽的防滑砖，求铺的防滑砖的面积是多少平方米？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">25.12 / 6.28</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">25 - 16</gadget>
<output>9</output>

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

<result>28.26</result>