If a rope is formed into a rectangle with a length of 8 meters and a width of 2 meters, if the rope is formed into a square, what is the area of the square in square meters?
一根绳子，恰好围成一个长8米，宽2米的长方形，若把这根绳子围成一个正方形，这个正方形的面积是多少平方米．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>