10.28 cm iron wire is used to form a semicircle, what is the area of the semicircle in square centimeters?
用10.28厘米的铁丝围成一个半圆形，半圆形的面积是多少平方厘米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 4 * (1/2)</gadget>
<output>6.28</output>

<result>6.28</result>