There is a square flower bed with a perimeter of 36 meters in front of the school teaching building. What is the area of the flower bed in square meters?
学校教学楼前面有一个周长为36米的正方形花坛，花坛的面积是多少平方米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>