A circular flower bed is to be built in a square with a diameter of 40 meters. If you want to add a stainless steel guardrail around the flower bed, what is the minimum length of the guardrail? If you start from the periphery of the flower bed and expand outward by 2 meters to build a circular cement road, what is the area of the cement road?
某广场要要修建一个圆形花坛，花坛直径为40米．若要在花坛外围加一圈不锈钢护栏，护栏要至少要多长？若以花坛外围为起点，向外扩2米，修一个环形水泥路，水泥路的面积多大？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<gadget id="calculator">22 ** 2</gadget>
<output>484</output>

<gadget id="calculator">3.14 * 484</gadget>
<output>1_519.76</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">1_519.76 - 1_256</gadget>
<output>263.76</output>

<result>263.76</result>