The base of the parallelogram is twice the base of the triangle and the heights are equal, so the area of the parallelogram is equal to how many times the area of the triangle.
平行四边形的底是三角形底的2倍，高相等，平行四边形的面积就是三角形面积的多少倍．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>