What is the area of a square with a perimeter of 36 decimeters?
一个周长36分米的正方形，它的面积是多少平方分米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

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

<result>81</result>