56 students are playing games on the playground. They form a square with equal numbers on each side and people at all four vertices. How many people are there on each side?
56名学生在操场上做游戏，大家围成一个正方形，每边人数相等，四个顶点都有人．每边各有多少人？
<gadget id="calculator">56 + 4</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>