In track and field competitions, the throwing circle of the shot put is a circle with a diameter of 2.1 meters, and the throwing circle of the discus is a circle with a diameter of 2.5 meters. By how many square meters is the discus throwing circle larger than the shot put throwing circle?
在田径比赛中，铅球的投掷圈是直径2.1米的圆，铁饼的投掷圈是直径2.5米的圆．铁饼投掷圈的面积比铅球投掷圈的面积大多少平方米？
<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 ** 2</gadget>
<output>1.5625</output>

<gadget id="calculator">2.1 / 2</gadget>
<output>1.05</output>

<gadget id="calculator">1.05 ** 2</gadget>
<output>1.1025</output>

<gadget id="calculator">1.5625 - 1.1025</gadget>
<output>0.46</output>

<gadget id="calculator">3.14 * 0.46</gadget>
<output>1.4444</output>

<result>1.4444</result>