Two squares with sides of equal length are put together to form a rectangle. The perimeter of the rectangle is 27 cm. What is the area of the rectangle in square centimeters?
把两个边长相等的正方形拼成一个长方形，长方形的周长是27cm，长方形的面积是多少平方厘米？
<gadget id="calculator">27 / 2</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">(27/2) / 3</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(27/2) - (9/2)</gadget>
<output>9</output>

<gadget id="calculator">9 * (9/2)</gadget>
<output>81/2 = around 40.5</output>

<result>81/2 = around 40.5</result>