There is a square pond with side length 100 meters. Plant trees around the pond at a distance of 2 meters from the edge of the pond. A total of 208 trees are planted, which also form a square. If the distance between two adjacent trees is the same, what is the distance in meters?
有一个边长为100米的正方形池塘．在池塘外离池边2米处围绕池塘种树，一共种了208棵树，也围成一个正方形．若相邻两棵树之间的距离相等，则这个距离是多少米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">100 + 4</gadget>
<output>104</output>

<gadget id="calculator">104 * 4</gadget>
<output>416</output>

<gadget id="calculator">416 / 208</gadget>
<output>2</output>

<result>2</result>