There is a circular open space with a radius of 6 meters in a certain campus. It is planned to build a circular garden with a radius of 4 meters in the center of it. The remaining part is paved with cement pavement. What is the area of the cement pavement in square meters?
某校园内有一块半径6米的圆形空地，计划在它的中央修一个半径是4米的圆形花园，剩余部分铺成水泥路面，水泥路面的面积是多少平方米？
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>