rectangle with a perimeter of 72 centimeters is composed of three squares of exactly the same size. What is the area of the rectangle in square centimetres?
周长是72厘米的长方形，它正好由三个大小完全相等的正方形拼成，这个长方形的面积是多少平方厘米．
<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<gadget id="calculator">9 * 9 * 3</gadget>
<output>243</output>

<result>243</result>