What is the area of a semicircle with a circumference of 177 cm?
周长为177cm的半圆面积是多少．
<gadget id="calculator">34 / 2</gadget>
<output>17</output>

<gadget id="calculator">3.14 * 34 * 17</gadget>
<output>1_814.92</output>

<result>1_814.92</result>