triangle and a parallelogram with the same area and height, the base of the triangle is 9 meters, what is the base of the parallelogram?
面积和高相等的三角形和平行四边形，三角形的底是9米，平行四边形的底是多少．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>