Take a rectangular plank 8 meters long and 5 meters wide and saw it into a square with the largest area. What is the area of this square plank in square meters?
用一块长8米、宽5米的长方形木板，锯成一个面积最大的正方形，这块正方形木板的面积是多少平方米？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>