There is a circular flower bed with a diameter of 4 meters at the gate of a certain school. Now it is necessary to build a path with a width of 1 meter around the flower bed. What is the area of the path?
某学校门口有一个直径是4米的圆形花坛，现要在花坛的周围修一条1米宽的小路，小路的面积是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>