The circumference of a teacup is about 25.12 cm. What is the approximate area of the lid of this teacup in square centimeters?
一个茶杯，杯口周长约是25.12厘米，这个茶杯杯盖的面积大约是多少平方厘米？
<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>