Trees are planted around a square site, and one tree is planted at each of the four vertices. A total of 36 trees are planted. How many trees are planted on each side?
在一个正方形场地四周种树，四个顶点都种1棵树，一共种了36棵树，每边种多少棵棵．
<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<result>10</result>