The perimeter of a circular performance stage is 6.28 meters. Now it is widened by 0.5 meters around it. How many square meters is the area increased now?
一圆形表演台周长是6.28米，现在把它周围加宽0.5米，现在面积比原来增加多平方米？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 + 0.5</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

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

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

<gadget id="calculator">7.065 - 3.14</gadget>
<output>3.925</output>

<result>3.925</result>