A square flower bed, one side of it is against the wall, and the other three sides are surrounded by fences. The length of the bamboo fence is 15 meters. What is the area of the nursery in square meters?
一块正方形的花圃，它的一条边靠墙，其余三边围上篱笆，竹篱笆长15米，苗圃的面积是多少平方米？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>