There is a semicircular flower bed with a diameter of 20 meters in the civic square, and there is a cobblestone path with a width of 1.5 meters along the arc of the flower bed. What is the area of this path in square meters?
市民广场有一个直径为20米的半圆形花坛，靠着花坛圆弧有一条1.5米宽的鹅卵石小路，这条小路的面积是多少平方米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 1.5</gadget>
<output>11.5</output>

<gadget id="calculator">11.5 ** 2</gadget>
<output>132.25</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">132.25 - 100</gadget>
<output>32.25</output>

<gadget id="calculator">32.25 / 2</gadget>
<output>16.125</output>

<gadget id="calculator">3.14 * 16.125</gadget>
<output>50.6325</output>

<result>50.6325</result>