triangle and a parallelogram have the same base and height, the area of the triangle is 12cm**2, what is the area of the parallelogram?
一个三角形和一个平行四边形底和高分别相等，三角形的面积是12cm**2，平行四边形的面积是多少．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>