There is a circular speech platform in the exhibition center with a circumference of 4.71m. Now widen the surrounding area by 1m, how many square meters is the current area larger than the original?
会展中心有一个圆形发言台，周长是4.71m．现在再把周围加宽1m，现在的面积比原来增大多少平方米？
<gadget id="calculator">4.71 / 3.14 / 2</gadget>
<output>0.75</output>

<gadget id="calculator">0.75 + 1</gadget>
<output>1.75</output>

<gadget id="calculator">1.75 ** 2</gadget>
<output>3.0625</output>

<gadget id="calculator">3.14 * 3.0625</gadget>
<output>9.61625</output>

<gadget id="calculator">0.75 ** 2</gadget>
<output>0.5625</output>

<gadget id="calculator">3.14 * 0.5625</gadget>
<output>1.76625</output>

<gadget id="calculator">9.61625 - 1.76625</gadget>
<output>7.85</output>

<result>7.85</result>