The circumference of a semicircle is 10.28 cm, what is its area in square centimeters?
半圆的周长是10.28cm，它的面积是多少平方厘米？
<gadget id="calculator">10.28 / 5.14</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>