The side length of a square is 8 cm, if the side length is increased by 2 cm, what percentage is the area increased?
正方形的边长是8厘米，如果边长增加了2厘米，则面积增加了百分之几？
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

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

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

<gadget id="calculator">100 - 64</gadget>
<output>36</output>

<gadget id="calculator">36 / 64</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>