circular stage has a circumference of 6.28 meters. Now widen the circumference of the circular stage by 1 meter. How much is the current area larger than before?
一个圆形表演台，周长是6.28米．现在把这个圆形表演台周围加宽1米．现在的面积比原来增大了多少？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">12.56 - 3.14</gadget>
<output>9.42</output>

<result>9.42</result>