How many square centimeters are left after cutting a circular mirror with a circumference of 25.12 cm from a rectangular lens with a length of 10 cm and a width of 8 cm?
从一个长10厘米，宽8厘米的长方形镜片上，切割出一个周长是25.12厘米的圆镜后，余下的边角料是多少平方厘米？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<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>

<gadget id="calculator">80 - 50.24</gadget>
<output>29.76</output>

<result>29.76</result>