The fourth-grade students of a certain school formed a square formation to participate in the school broadcasting exercise competition. Due to the large number of students, one row and one column were removed, and 29 people were removed. May I ask how many people there were?
某校四年级学生排成了一个正方形的方阵参加学校广播操比赛，由于人数太多，所以去掉了一行一列，这样去掉了29人．请问原来有多少人？
<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<result>225</result>