A and B each have a 6.28-meter-long iron wire. A uses it to form a square, and B uses it to form a circle. Ask the two people who encloses the largest area and how much larger?
甲、乙两人每人有一根长6.28米的铁丝，甲用它围成了一个正方形，乙用它围成了一个圆，问两人谁围成的面积大，大多少？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

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

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

<gadget id="calculator">6.28 / 4</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 * 1.57</gadget>
<output>2.4649</output>

<gadget id="calculator">3.14 - 2.4649</gadget>
<output>0.6751</output>

<result>0.6751</result>