There is a flower bed with a diameter of 8 meters in the center of the playground of the Experimental Primary School. The school plans to build a 4-meter-wide circular gravel road around the flower bed. What is the area of this road?
实验小学操场中央有一个直径为8米的花坛，学校打算在花坛外围修一条4米宽的环形石子路，这条路的面积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

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

<gadget id="calculator">64 - 16</gadget>
<output>48</output>

<gadget id="calculator">3.14 * 48</gadget>
<output>150.72</output>

<result>150.72</result>