The circumference of a semicircle is 20.56 meters, what is the area of the semicircle in square meters?
一个半圆的周长是20.56米，这个半圆的面积是多少平方米？
<gadget id="calculator">3.14 + 2</gadget>
<output>5.14</output>

<gadget id="calculator">20.56 / 5.14</gadget>
<output>4</output>

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

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * 16 * (1/2)</gadget>
<output>25.12</output>

<result>25.12</result>