A square is surrounded by a length of 25.12 cm iron wire, and a circle is formed by this iron wire. What is the area of this circle in square centimeters?
用一段长25.12厘米铁丝围成一个正方形，用这根铁丝围成一圆，这个圆面积是多少平方厘米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>