A flower bed is a right-angled trapezoid with a circumference of 72 meters. The ratio of the sum of the two bases to the sum of the two waists is 13:5. One of the waists is 12 meters long. Find the area of the flower bed.
一个花坛是直角梯形，周长72米，两底之和与两腰之和的比是13：5，其中一条腰长12米，求这个花坛的面积．
<gadget id="calculator">13 + 5</gadget>
<output>18</output>

<gadget id="calculator">72 / 18</gadget>
<output>4</output>

<gadget id="calculator">4 * 13</gadget>
<output>52</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">52 * 4</gadget>
<output>208</output>

<result>208</result>