Divide a circle with a circumference of 12.56 meters into two semicircles, what is the area of each semicircle in meters**2.
把一个周长为12.56米的圆平均分成两个半圆，每个半圆的面积是多少米**2．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>