Uncle Wang made a window with 36 decimeter long wooden strips. What is the area of glass in this window? (The thickness of the wood strips is ignored)
王叔叔用36分米长的木条做了一个窗子．这个窗子上的玻璃面积是多少？(木条厚度忽略不算)
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

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

<result>81</result>