Two rectangular transparent ribbons with a width of 8cm are overlapped to form a parallelogram with four equal sides. If the area of the overlap is 80cm**2, what is the perimeter of the parallelogram in cm?
用两条宽度是8cm的长方形透明色带交叠成一个四条边都相等的平行四边形，如果交叠出的面积是80cm**2，那么这个平行四边形的周长是多少cm．
<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>