triangle and a parallelogram with the same base and height, if the area of the triangle is 8.5 square centimeters, what is the area of the parallelogram?
一个等底等高的三角形和平行四边形，如果三角形的面积是8.5平方厘米，那么平行四边形的面积是多少．
<gadget id="calculator">8.5 * 2</gadget>
<output>17</output>

<result>17</result>