A square vegetable field is surrounded by a wall on one side and a fence on the other three sides. The fence is 105 meters long. What is the area of this vegetable field in square meters?
一块正方形菜地，一边靠墙，其他三边围篱笆，篱笆长105米，这块菜地面积是多少平方米？
<gadget id="calculator">105 / 3</gadget>
<output>35</output>

<gadget id="calculator">35 * 35</gadget>
<output>1_225</output>

<result>1_225</result>