Both the parallelogram and the rectangle have an area of 36 square centimeters. The length of the rectangle is 9 centimeters, which is twice the height of the parallelogram. What is the base of the parallelogram in centimeters?
平行四边形和长方形的面积都是36平方厘米，长方形的长是9厘米，是平行四边形高的2倍，平行四边形的底是多少厘米
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">36 / (9/2)</gadget>
<output>8</output>

<result>8</result>