Two triangles and a parallelogram with the same base and height, the area of the triangle is 8 square meters, what is the area of the parallelogram in square meters?
两个等底等高的三角形和平行四边形，三角形的面积是8平方米，平行四边形的面积是多少平方米．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>