parallelogram vegetable field has a base of 8 meters and a height twice that of the base. What is the area in square meters?
一块平行四边形的菜地，它的底是8米，高是底的2倍，面积是多少平方米．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">8 * 16</gadget>
<output>128</output>

<result>128</result>