concrete road with a width of 3 meters is laid around a circular fountain with a diameter of 16 meters. What is the area of the cement road in square meters?
在一个直径是16米的圆形喷水池周围铺设一条3米宽的水泥路，这条水泥路的面积是多少平方米？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<gadget id="calculator">11 ** 2</gadget>
<output>121</output>

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

<gadget id="calculator">121 - 64</gadget>
<output>57</output>

<gadget id="calculator">3.14 * 57</gadget>
<output>178.98</output>

<result>178.98</result>