The circumference of a circle is 50.24 meters, when the radius increases by 2 meters, how much does the area increase?
一个圆的周长是50.24米，半径增加2米后，面积增加多少．
<gadget id="calculator">50.24 / 3.14 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<gadget id="calculator">314 - 200.96</gadget>
<output>113.04</output>

<result>113.04</result>